--- a/simgear/misc/strutils.cxx
+++ b/simgear/misc/strutils.cxx
@@ -43,6 +43,11 @@
 	#include <windows.h>
 #endif
 
+#ifdef _GNU_SOURCE
+#undef _GNU_SOURCE
+#define _POSIX_C_SOURCE 200112L
+#endif
+
 using std::string;
 using std::vector;
 using std::stringstream;
--- a/simgear/package/md5.h
+++ b/simgear/package/md5.h
@@ -20,9 +20,9 @@
 #endif
      
 #if defined(_MSC_VER)
-typedef unsigned char    u_int8_t;
-typedef unsigned int     u_int32_t;
-typedef unsigned __int64 u_int64_t;
+typedef unsigned char    uint8_t;
+typedef unsigned int     uint32_t;
+typedef unsigned __int64 uint64_t;
 #endif
      
 #define	MD5_BLOCK_LENGTH		64
@@ -30,16 +30,16 @@
 #define	MD5_DIGEST_STRING_LENGTH	(MD5_DIGEST_LENGTH * 2 + 1)
 
 typedef struct MD5Context {
-	u_int32_t state[4];			/* state */
-	u_int64_t count;			/* number of bits, mod 2^64 */
-	u_int8_t buffer[MD5_BLOCK_LENGTH];	/* input buffer */
+	uint32_t state[4];			/* state */
+	uint64_t count;			/* number of bits, mod 2^64 */
+	uint8_t buffer[MD5_BLOCK_LENGTH];	/* input buffer */
 } SG_MD5_CTX;
 
 void	 SG_MD5Init(SG_MD5_CTX *);
-void	 SG_MD5Update(SG_MD5_CTX *, const u_int8_t *, size_t);
+void	 SG_MD5Update(SG_MD5_CTX *, const uint8_t *, size_t);
 void	 SG_MD5Pad(SG_MD5_CTX *);
-void	 SG_MD5Final(u_int8_t [MD5_DIGEST_LENGTH], SG_MD5_CTX *);
-void	 SG_MD5Transform(u_int32_t [4], const u_int8_t [MD5_BLOCK_LENGTH]);
+void	 SG_MD5Final(uint8_t [MD5_DIGEST_LENGTH], SG_MD5_CTX *);
+void	 SG_MD5Transform(uint32_t [4], const uint8_t [MD5_BLOCK_LENGTH]);
 
 #ifdef __cplusplus
 } // of extern C
@@ -49,4 +49,4 @@
 
      
 
- 
\ No newline at end of file
+