Check if valgrind.h exists

Author: czurnieden

demo/test.c

@@ -5,8 +5,17 @@
 #include "s_mp_rand_jenkins.c"
 
 /* TODO: Make it an environment variable via main.yml?
-         This is for testing only, so no  to add checks to the build process. */
-#include <valgrind/valgrind.h>
+         This is for testing only, so no reason to add checks to the build process. */
+#ifdef __has_include
+#   if __has_include (<valgrind/valgrind.h>)
+#      include <valgrind/valgrind.h>
+#   endif
+#else
+#   define RUNNING_ON_VALGRIND 1
+#endif
+#else
+#   define RUNNING_ON_VALGRIND 1
+#endif
 
 static long rand_long(void)
 {