Workaround for homebrew gettext when building xz.

recipes/xz/recipe.sh

@@ -14,7 +14,12 @@ function recipe_update {
 function recipe_build {
     export CFLAGS="-static"
 
-    ./autogen.sh
+    # autogen.sh requires autopoint which is provided by the gettext homebrew
+    # formula on macOS. Unfortunately, homebrew does not install it into PATH
+    # because macOS provides the BSD gettext library. So we make sure to include
+    # it in PATH.
+    PATH="/usr/local/opt/gettext/bin:$PATH" ./autogen.sh
+
     chmod +w build-aux/config.sub
     wget -O build-aux/config.sub http://git.savannah.gnu.org/cgit/config.git/plain/config.sub
     ./configure \