diff --git a/cpucount.c b/cpucount.c
index 32f32ff..74ed782 100644
--- a/cpucount.c
+++ b/cpucount.c
@@ -124,6 +124,7 @@ int cpucount(void)
 #endif
 #ifdef __linux__
 	// try parsing /proc/cpuinfo
+	// NOTE seems cygwin can provide this too, idk if need tho
 	ncpu = parsecpuinfo();
 	if (ncpu > 0)
 		return ncpu;
diff --git a/main.c b/main.c
index 522a91b..f4ea80e 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,4 @@
-#ifdef __linux__
+#ifdef __GLIBC__
 #define _POSIX_C_SOURCE 200112L
 #endif
 
diff --git a/worker.c b/worker.c
index fe4d606..db279b0 100644
--- a/worker.c
+++ b/worker.c
@@ -1,4 +1,4 @@
-#ifdef __linux__
+#ifdef __GLIBC__
 #define _POSIX_C_SOURCE 200112L
 #endif
 
diff --git a/yaml.c b/yaml.c
index 6a16965..4649ac7 100644
--- a/yaml.c
+++ b/yaml.c
@@ -1,4 +1,4 @@
-#ifdef __linux__
+#ifdef __GLIBC__
 #define _POSIX_C_SOURCE 200112L
 #endif