diff --git a/Cargo.lock b/Cargo.lock
index e285b13c93869f3a37cd8797f3ef8a9e8d3e8157..f2933754c0d84a81c5e46a7f730da73387e38792 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -18,27 +18,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "atty"
-version = "0.2.3"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "backtrace"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -47,14 +44,9 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "bitflags"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "bitflags"
 version = "1.0.1"
@@ -70,7 +62,7 @@ name = "calculate"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "atty 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.29.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "decimal 2.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "liner 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -92,7 +84,7 @@ version = "2.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "atty 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "textwrap 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -100,15 +92,6 @@ dependencies = [
  "vec_map 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "dbghelp-sys"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "decimal"
 version = "2.0.4"
@@ -116,10 +99,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "ord_subset 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -127,7 +110,7 @@ name = "failure"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -148,19 +131,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "fuchsia-zircon"
-version = "0.2.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fuchsia-zircon-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "fuchsia-zircon-sys"
-version = "0.2.0"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "glob"
@@ -180,13 +161,13 @@ dependencies = [
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "libloading 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "liner 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "permutate 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallstring 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-segmentation 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -221,7 +202,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.34"
+version = "0.2.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -249,7 +230,7 @@ name = "memchr"
 version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -269,16 +250,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rand"
-version = "0.3.18"
+version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "fuchsia-zircon 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.32"
+version = "0.1.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -286,24 +267,24 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex"
-version = "0.2.3"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -318,7 +299,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.24"
+version = "1.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -376,8 +357,8 @@ name = "termion"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -426,7 +407,7 @@ name = "users"
 version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -454,11 +435,30 @@ name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "winapi"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-i686-pc-windows-gnu 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-x86_64-pc-windows-gnu 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "xdg"
 version = "2.1.0"
@@ -468,43 +468,41 @@ source = "git+https://github.com/whitequark/rust-xdg#a1c9249f78a5395c2ee3dc8688a
 "checksum aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d6531d44de723825aa81398a6415283229725a00fa30713812ab9323faa82fc4"
 "checksum ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6b3568b48b7cefa6b8ce125f9bb4989e52fbcc29ebea88df04cc7c5f12f70455"
 "checksum ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "23ac7c30002a5accbf7e8987d0632fa6de155b7c3d39d0067317a391e00a2ef6"
-"checksum atty 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "21e50800ec991574876040fff8ee46b136a53e985286fbe6a3bdfe6421b78860"
-"checksum backtrace 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8709cc7ec06f6f0ae6c2c7e12f6ed41540781f72b488d83734978295ceae182e"
+"checksum atty 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "8352656fd42c30a0c3c89d26dea01e3b77c0ab2af18230835c15e2e13cd51859"
+"checksum backtrace 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ebbbf59b1c43eefa8c3ede390fcc36820b4999f7914104015be25025e0d62af2"
 "checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
-"checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b3c30d3802dfb7281680d6285f2ccdaa8c2d8fee41f93805dba5c4cf50dc23cf"
 "checksum bytecount 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "4bbeb7c30341fce29f6078b4bdf876ea4779600866e98f5b2d203a534f195050"
 "checksum calculate 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dfe3fe310e5858ba47beb9443acec7fb39b90ea5677d35636306fe7b495a547c"
 "checksum cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a9b13a57efd6b30ecd6598ebdb302cca617930b5470647570468a65d12ef9719"
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-"checksum dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "97590ba53bcb8ac28279161ca943a924d1fd4a8fb3fa63302591647c4fc5b850"
 "checksum decimal 2.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "e6458723bc760383275fbc02f4c769b2e5f3de782abaf5e7e0b9b7f0368a63ed"
 "checksum failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "934799b6c1de475a012a02dab0ace1ace43789ee4b99bcfbf1a2e3e8ced5de82"
 "checksum failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c7cdda555bb90c9bb67a3b670a0f42de8e73f5981524123ad8578aafec8ddb8b"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
-"checksum fuchsia-zircon 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f6c0581a4e363262e52b87f59ee2afe3415361c6ec35e665924eb08afe8ff159"
-"checksum fuchsia-zircon-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "43f3795b4bae048dc6123a6b972cadde2e676f9ded08aef6bb77f5f157684a82"
+"checksum fuchsia-zircon 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bd510087c325af53ba24f3be8f1c081b0982319adcb8b03cad764512923ccc19"
+"checksum fuchsia-zircon-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "08b3a6f13ad6b96572b53ce7af74543132f1a7055ccceb6d073dd36c54481859"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
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 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
 "checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
-"checksum libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)" = "36fbc8a8929c632868295d0178dd8f63fc423fd7537ad0738372bd010b3ac9b0"
+"checksum libc 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)" = "96264e9b293e95d25bfcbbf8a88ffd1aedc85b754eba8b7d78012f638ba220eb"
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 "checksum liner 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "e21c5e49e5d73f18124fd3c751a0823f754c5ae7193cb9e8aa467b03b161241c"
 "checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
 "checksum ord_subset 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc65e6e24476e1a5baed530f60b918ff7925539aaae1d59ab51113c991321c40"
 "checksum permutate 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "53b7d5b19a715ffab38693a9dd44b067fdfa2b18eef65bd93562dfe507022fae"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
-"checksum rand 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)" = "6475140dfd8655aeb72e1fd4b7a1cc1c202be65d71669476e392fe62532b9edd"
-"checksum redox_syscall 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = "ab105df655884ede59d45b7070c8a65002d921461ee813a024558ca16030eea0"
+"checksum rand 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)" = "9e7944d95d25ace8f377da3ac7068ce517e4c646754c43a1b1849177bbf72e59"
+"checksum redox_syscall 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)" = "df1a5c588807af3b0cbbfa2f1358f2d5ec6ad546858c1ccd30dfbb127021706b"
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
-"checksum regex 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ac6ab4e9218ade5b423358bbd2567d1617418403c7a512603630181813316322"
-"checksum regex-syntax 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ad890a5eef7953f55427c50575c680c42841653abd2b028b68cd223d157f62db"
+"checksum regex 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "744554e01ccbd98fff8c457c3b092cd67af62a555a43bfe97ae8a0451f7799fa"
+"checksum regex-syntax 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8e931c58b93d86f080c734bfd2bce7dd0079ae2331235818133c8be7f422e20e"
 "checksum rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "aee45432acc62f7b9a108cc054142dac51f979e69e71ddce7d6fc7adf29e817e"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
-"checksum serde 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)" = "1c57ab4ec5fa85d08aaf8ed9245899d9bbdd66768945b21113b84d5f595cb6a1"
+"checksum serde 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)" = "db99f3919e20faa51bb2996057f5031d8685019b5a06139b1ce761da671b8526"
 "checksum smallstring 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "30950abdb5b38f56a0e181ae56ed64a539b64fa77ea6325147203dc7faeb087f"
 "checksum smallvec 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4f8266519bc1d17d0b5b16f6c21295625d562841c708f6376f49028a43e9c11e"
 "checksum smallvec 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "ee4f357e8cd37bf8822e1b964e96fd39e2cb5a0424f8aaa284ccaccc2162411c"
@@ -525,5 +523,8 @@ source = "git+https://github.com/whitequark/rust-xdg#a1c9249f78a5395c2ee3dc8688a
 "checksum version_check 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6b772017e347561807c1aa192438c5fd74242a670a6cffacc40f2defd1dc069d"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+"checksum winapi 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b09fb3b6f248ea4cd42c9a65113a847d612e17505d6ebd1f7357ad68a8bf8693"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+"checksum winapi-i686-pc-windows-gnu 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ec6667f60c23eca65c561e63a13d81b44234c2e38a6b6c959025ee907ec614cc"
+"checksum winapi-x86_64-pc-windows-gnu 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "98f12c52b2630cd05d2c3ffd8e008f7f48252c042b4871c72aed9dc733b96668"
 "checksum xdg 2.1.0 (git+https://github.com/whitequark/rust-xdg)" = "<none>"
diff --git a/src/lib/sys/redox.rs b/src/lib/sys/redox.rs
index 95b652fe019e8dfbf209a037ac22470d0bf0b35c..58e1cd478f39a244a0d73b5797fa865a972a2b02 100644
--- a/src/lib/sys/redox.rs
+++ b/src/lib/sys/redox.rs
@@ -7,7 +7,7 @@ use std::os::unix::io::RawFd;
 use std::path::PathBuf;
 use std::process::{exit, ExitStatus};
 use std::os::unix::process::ExitStatusExt;
-use syscall::{EINTR, SigAction, waitpid};
+use syscall::{EINTR, WUNTRACED, SigAction, waitpid};
 
 pub(crate) const PATH_SEPARATOR: &str = ";";
 pub(crate) const NULL_PATH: &str = "null:";
@@ -39,7 +39,7 @@ pub fn wait_for_interrupt(pid: u32) -> io::Result<()> {
     let mut status = 0;
 
     loop {
-        match waitpid(pid as usize, &mut status, 0) {
+        match waitpid(pid as usize, &mut status, WUNTRACED) {
             Err(ref error) if error.errno == EINTR => continue,
             Err(ref error) => break Err(io::Error::from_raw_os_error(error.errno)),
             Ok(_) => break Ok(()),
@@ -53,7 +53,7 @@ pub fn wait_for_child(pid: u32) -> io::Result<u8> {
 
     loop {
         status = 0;
-        match waitpid(pid as usize, &mut status, 0) {
+        match waitpid(pid as usize, &mut status, WUNTRACED) {
             Err(ref error) if error.errno == ECHILD => break,
             Err(error) => return Err(io::Error::from_raw_os_error(error.errno)),
             _ => ()
@@ -307,7 +307,7 @@ pub mod job_control {
     use std::os::unix::process::ExitStatusExt;
     use std::process::ExitStatus;
     use std::sync::{Arc, Mutex};
-    use syscall::{self, ECHILD, waitpid};
+    use syscall::{self, ECHILD, WUNTRACED, waitpid};
     use super::{SIGINT, SIGPIPE};
 
     pub(crate) fn watch_background(
@@ -336,7 +336,7 @@ pub mod job_control {
 
         loop {
             status = 0;
-            let result = waitpid(pgid, &mut status, 0);
+            let result = waitpid(pgid, &mut status, WUNTRACED);
             match result {
                 Err(error) => {
                     match error.errno {