--- a/src/physfs_internal.h	Sat Jul 22 20:05:17 2017 -0400
+++ b/src/physfs_internal.h	Mon Jul 24 02:36:58 2017 -0400
@@ -35,7 +35,7 @@
 #include <malloc.h>
 #endif
 
-#if PHYSFS_PLATFORM_SOLARIS
+#ifdef PHYSFS_PLATFORM_SOLARIS
 #include <alloca.h>
 #endif
 
@@ -58,7 +58,7 @@
 #   define inline __inline
 #endif
 
-#if PHYSFS_PLATFORM_LINUX && !defined(_FILE_OFFSET_BITS)
+#if defined(PHYSFS_PLATFORM_LINUX) && !defined(_FILE_OFFSET_BITS)
 #define _FILE_OFFSET_BITS 64
 #endif
 
@@ -405,7 +405,7 @@
  *  Obviously, this isn't a function. If you need more than one char for this,
  *  you'll need to pull some old pieces of PhysicsFS out of revision control.
  */
-#if PHYSFS_PLATFORM_WINDOWS || PHYSFS_PLATFORM_OS2
+#if defined(PHYSFS_PLATFORM_WINDOWS) || defined(PHYSFS_PLATFORM_OS2)
 #define __PHYSFS_platformDirSeparator '\\'
 #else
 #define __PHYSFS_platformDirSeparator '/'

--- a/src/physfs_platform_unix.c	Sat Jul 22 20:05:17 2017 -0400
+++ b/src/physfs_platform_unix.c	Mon Jul 24 02:36:58 2017 -0400
@@ -53,7 +53,7 @@
 #include <sys/mnttab.h>
 #endif
 
-#if PHYSFS_PLATFORM_FREEBSD
+#ifdef PHYSFS_PLATFORM_FREEBSD
 #include <sys/sysctl.h>
 #endif
 
@@ -254,8 +254,8 @@
     const char *envr = NULL;
 
     /* Try to avoid using argv0 unless forced to. Try system-specific stuff. */
-    
-    #if PHYSFS_PLATFORM_FREEBSD
+
+    #if defined(PHYSFS_PLATFORM_FREEBSD)
     {
         char fullpath[PATH_MAX];
         size_t buflen = sizeof (fullpath);
@@ -263,7 +263,7 @@
         if (sysctl(mib, 4, fullpath, &buflen, NULL, 0) != -1)
             retval = __PHYSFS_strdup(fullpath);
     }
-    #elif PHYSFS_PLATFORM_SOLARIS
+    #elif defined(PHYSFS_PLATFORM_SOLARIS)
     {
         const char *path = getexecname();
         if ((path != NULL) && (path[0] == '/'))  /* must be absolute path... */