Fix compiling on Linux

src/gestures.c

@@ -37,6 +37,7 @@
 #if defined(_WIN32)
     //#include <Windows.h>
 #elif defined(__linux)
+    #include <sys/time.h>       // Declares storage size of ‘now’
     #include <time.h>           // Used for clock functions
 #endif
 
@@ -659,4 +660,4 @@ static EM_BOOL EmscriptenInputCallback(int eventType, const EmscriptenTouchEvent
 
     return 1;
 }
-#endif
+#endif

src/makefile

@@ -73,7 +73,7 @@ endif
 ifeq ($(PLATFORM),PLATFORM_RPI)
     CFLAGS = -O1 -Wall -std=gnu99 -fgnu89-inline
 else
-    CFLAGS = -O1 -Wall -std=c99
+    CFLAGS = -O1 -Wall -std=gnu99
 endif
 
 #CFLAGSEXTRA = -Wextra -Wmissing-prototypes -Wstrict-prototypes