1 files changed, 6 insertions, 1 deletions

diff --git a/util.c b/util.c
index 2872c37..81c4ce3 100644
--- a/util.c
+++ b/util.c
@@ -1,6 +1,10 @@
 #if _WIN32
 #include <intrin.h>
 #include <direct.h>
+#elif __unix__
+#include <unistd.h>
+#else
+#error "Unrecognized operating system."
 #endif
 
 static u8 util_popcount(u64 x) {
@@ -281,4 +285,5 @@ static void change_directory(char const *path) {
 #else
 	chdir(path);
 #endif
-}
\ No newline at end of file
+}
+