fix commit: introduce OUTerrorf() and IFerrorf()

src/frontend/outitf.h

@@ -63,7 +63,12 @@ int OUTendDomain(runDesc *plotPtr);
 int OUTattributes(runDesc *plotPtr, IFuid varName, int param, IFvalue *value);
 int OUTstopnow(void);
 void OUTerror(int flags, char *format, IFuid *names);
+
+#ifdef __GNUC__
 void OUTerrorf(int, const char *fmt, ...)  __attribute__ ((format (__printf__, 2, 3)));
+#else
+void OUTerrorf(int, const char *fmt, ...);
+#endif
 
 
 #endif

src/main.c

@@ -196,7 +196,13 @@ extern int OUTwData(runDesc *,int,IFvalue *,void *), OUTwEnd(runDesc *), OUTendP
 extern int OUTbeginDomain(runDesc *,IFuid,int,IFvalue *);
 extern int OUTendDomain(runDesc *), OUTstopnow(void);
 extern void OUTerror(int,char *,IFuid *);
+
+#ifdef __GNUC__
 extern void OUTerrorf(int, const char *fmt, ...)  __attribute__ ((format (__printf__, 2, 3)));
+#else
+extern void OUTerrorf(int, const char *fmt, ...);
+#endif
+
 extern int OUTattributes(runDesc *,IFuid,int,IFvalue *);
 
 extern void initw(void);