diff --git a/configure.ac b/configure.ac
index 356d3d4c..333f186f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,6 +50,7 @@ fi
 AM_CONDITIONAL([BUILD_FOR_LINUX], [test "x${with_os}" = xlinux ])
 AM_CONDITIONAL([BUILD_FOR_FREEBSD], [test "x${with_os}" = xfreebsd ])
 AM_CONDITIONAL([BUILD_FOR_OPENBSD], [test "x${with_os}" = xopenbsd ])
+AM_CONDITIONAL([BUILD_FOR_DARWIN], [test "x${with_os}" = xdarwin ])
 
 ##### Some build systems are not fully using pkg-config, so we can use the flag ${with_pkg_config} on a case-by-case basis
 ##### to control how to deal with them