shake: fix build on musl

Closes: #44674 [via git-merge-pr]

srcpkgs/shake/template

@@ -12,11 +12,11 @@ homepage="http://vleu.net/shake/"
 distfiles="https://github.com/unbrice/$pkgname/archive/v$version.tar.gz"
 checksum=ac5a57bd8d55e197734852bf66318ecf39b4c5c298e43a259ba1d8a4b7a2ced3
 
-case "$XBPS_TARGET_MACHINE" in
-*-musl)
-	broken="musl does not provide error.h required by this package"
-	;;
-esac
+CFLAGS="-D_GNU_SOURCE"
+
+if [ "$XBPS_TARGET_LIBC" = musl ]; then
+	makedepends+=" musl-legacy-compat"
+fi
 
 if [ -n "$CROSS_BUILD" ]; then
 	hostmakedepends+=" shake"