diff --git a/skeletons/OBJECT_IDENTIFIER.c b/skeletons/OBJECT_IDENTIFIER.c
index 9f6402e..4f1e69d 100644
--- a/skeletons/OBJECT_IDENTIFIER.c
+++ b/skeletons/OBJECT_IDENTIFIER.c
@@ -65,7 +65,7 @@
 
 int
 OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen, signed int add, void *rvbufp, unsigned int rvsize) {
-	unsigned LE __attribute__ ((unused)) = 1; /* Little endian (x86) */
+	unsigned LE GCC_NOTUSED = 1; /* Little endian (x86) */
 	uint8_t *arcend = arcbuf + arclen;	/* End of arc */
 	unsigned int cache = 0;	/* No more than 14 significant bits */
 	unsigned char *rvbuf = (unsigned char *)rvbufp;
diff --git a/skeletons/REAL.c b/skeletons/REAL.c
index 32f9221..df5b9b3 100644
--- a/skeletons/REAL.c
+++ b/skeletons/REAL.c
@@ -18,7 +18,7 @@
 #define	INT_MAX	((int)(((unsigned int)-1) >> 1))
 
 #if	!(defined(NAN) || defined(INFINITY))
-static volatile double real_zero __attribute__ ((unused)) = 0.0;
+static volatile double real_zero GCC_NOTUSED = 0.0;
 #endif
 #ifndef	NAN
 #define	NAN	(real_zero/real_zero)
@@ -521,8 +521,8 @@
 	uint8_t buf[16];	/* More than enough for 8-byte dbl_value */
 	uint8_t dscr[sizeof(dbl_value)];	/* double value scratch pad */
 	/* Assertion guards: won't even compile, if unexpected double size */
-	char assertion_buffer1[9 - sizeof(dbl_value)] __attribute__((unused));
-	char assertion_buffer2[sizeof(dbl_value) - 7] __attribute__((unused));
+	char assertion_buffer1[9 - sizeof(dbl_value)] GCC_NOTUSED;
+	char assertion_buffer2[sizeof(dbl_value) - 7] GCC_NOTUSED;
 	uint8_t *ptr = buf;
 	uint8_t *mstop;		/* Last byte of mantissa */
 	unsigned int mval;	/* Value of the last byte of mantissa */
diff --git a/skeletons/asn_system.h b/skeletons/asn_system.h
index d7ebdaa..6dcca0e 100644
--- a/skeletons/asn_system.h
+++ b/skeletons/asn_system.h
@@ -82,10 +82,16 @@
 #ifndef	GCC_PRINTFLIKE
 #define	GCC_PRINTFLIKE(fmt,var)	__attribute__((format(printf,fmt,var)))
 #endif
+#ifndef	GCC_NOTUSED
+#define	GCC_NOTUSED		__attribute__((unused))
+#endif
 #else
 #ifndef	GCC_PRINTFLIKE
 #define	GCC_PRINTFLIKE(fmt,var)	/* nothing */
 #endif
+#ifndef	GCC_NOTUSED
+#define	GCC_NOTUSED
+#endif
 #endif
 
 #ifndef	offsetof	/* If not defined by <stddef.h> */