revert 1a01b46 to 1b167b5

src/smatrix.c

@@ -18,11 +18,16 @@
    linsolve()     -- called from netsolve() in HYDRAUL.C
 */
 
-#include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#ifndef __APPLE__
+#include <malloc.h>
+#else
+#include <stdlib.h>
+#endif
 #include <math.h>
 #include <limits.h>
+
 #include <time.h>  //For optional timer macros
 
 #include "text.h"