diff -ur sox-14.0.0.old/src/gsm.c sox-14.0.0/src/gsm.c
--- sox-14.0.0.old/src/gsm.c	2007-09-13 12:17:06.000000000 -0700
+++ sox-14.0.0/src/gsm.c	2007-09-13 12:20:20.000000000 -0700
@@ -29,7 +29,11 @@
 #include "sox_i.h"
 
 #ifdef EXTERNAL_GSM
+#ifdef HAVE_GSM_GSM_H
 #include <gsm/gsm.h>
+#elif HAVE_GSM_H
+#include <gsm.h>
+#endif
 #else
 #include "../libgsm/gsm.h"
 #endif
diff -ur sox-14.0.0.old/src/wav.c sox-14.0.0/src/wav.c
--- sox-14.0.0.old/src/wav.c	2007-09-13 12:17:06.000000000 -0700
+++ sox-14.0.0/src/wav.c	2007-09-13 12:20:59.000000000 -0700
@@ -24,7 +24,11 @@
 #include "ima_rw.h"
 #include "adpcm.h"
 #ifdef EXTERNAL_GSM
+#ifdef HAVE_GSM_GSM_H
 #include <gsm/gsm.h>
+#elif HAVE_GSM_H
+#include <gsm.h>
+#endif
 #else
 #include "../libgsm/gsm.h"
 #endif