6 files changed, 26 insertions, 1 deletions
diff --git a/src/lib/dev.c b/src/lib/dev.c
index dd908f78..1d1e9476 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -20,9 +20,14 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#else
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include <ouroboros/endian.h>
 
-#define _POSIX_C_SOURCE 200809L
 #include "config.h"
 
 #include <ouroboros/hash.h>
diff --git a/src/lib/hash.c b/src/lib/hash.c
index 9b74967b..10e10c13 100644
--- a/src/lib/hash.c
+++ b/src/lib/hash.c
@@ -23,6 +23,10 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#endif
+
 #include "config.h"
 
 #include <ouroboros/hash.h>
diff --git a/src/lib/hashtable.c b/src/lib/hashtable.c
index be5c3ffd..68a0f545 100644
--- a/src/lib/hashtable.c
+++ b/src/lib/hashtable.c
@@ -20,6 +20,10 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#endif
+
 #include <ouroboros/hashtable.h>
 #include <ouroboros/list.h>
 #include <ouroboros/errno.h>
diff --git a/src/lib/irm.c b/src/lib/irm.c
index 6a9f837e..bd34669f 100644
--- a/src/lib/irm.c
+++ b/src/lib/irm.c
@@ -20,7 +20,11 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#else
 #define _POSIX_C_SOURCE 200809L
+#endif
 
 #include <ouroboros/errno.h>
 #include <ouroboros/hash.h>
diff --git a/src/lib/md5.c b/src/lib/md5.c
index 6f2b2e36..959865fe 100644
--- a/src/lib/md5.c
+++ b/src/lib/md5.c
@@ -40,6 +40,10 @@
  * or FITNESS FOR A PARTICULAR PURPOSE.  Use this program  at  your own risk!
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#endif
+
 #include <ouroboros/endian.h>
 #include <ouroboros/md5.h>
 
diff --git a/src/lib/sha3.c b/src/lib/sha3.c
index 6179af22..f6a82c57 100644
--- a/src/lib/sha3.c
+++ b/src/lib/sha3.c
@@ -42,6 +42,10 @@
  * or FITNESS FOR A PARTICULAR PURPOSE.  Use this program  at  your own risk!
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#endif
+
 #include <ouroboros/endian.h>
 #include <ouroboros/sha3.h>