diff --git a/mk/prog.mk b/mk/prog.mk
index c7105173..d8c514f4 100644
--- a/mk/prog.mk
+++ b/mk/prog.mk
@@ -23,7 +23,7 @@ LDFLAGS+=		${PROGLDFLAGS}
 all: depend ${PROG}
 
 ${PROG}: ${SCRIPTS} ${OBJS}
-	${CC} ${CFLAGS} ${LDFLAGS} -o $@ ${OBJS} ${LDADD}
+	${CC} ${LDFLAGS} -o $@ ${OBJS} ${LDADD}
 
 clean:
 	rm -f ${OBJS} ${PROG} ${CLEANFILES}
diff --git a/src/includes/rc-misc.h b/src/includes/rc-misc.h
index 1ffe48de..59c3e397 100644
--- a/src/includes/rc-misc.h
+++ b/src/includes/rc-misc.h
@@ -70,7 +70,7 @@
 #ifdef lint
 # define _unused
 #endif
-#if __GNUC__ > 2 || defined(__INTEL_COMPILER)
+#if __GNUC__ > 2 || defined(__INTEL_COMPILER) || defined(__PCC__)
 # define _unused __attribute__((__unused__))
 #endif
 
diff --git a/src/libeinfo/einfo.h b/src/libeinfo/einfo.h
index ca2487b4..49ef03fb 100644
--- a/src/libeinfo/einfo.h
+++ b/src/libeinfo/einfo.h
@@ -27,7 +27,7 @@
 #ifndef __EINFO_H__
 #define __EINFO_H__
 
-#ifdef __GNUC__
+#if defined(__GNUC__) || defined(__PCC__)
 # define __EINFO_PRINTF  __attribute__ ((__format__ (__printf__, 1, 2)))
 # define __EINFO_XPRINTF __attribute__ ((__noreturn__, __format__ (__printf__, 1, 2)))
 # define __EEND_PRINTF   __attribute__ ((__format__ (__printf__, 2, 3)))
diff --git a/src/rc/_usage.c b/src/rc/_usage.c
index 0e39271d..6dcb63aa 100644
--- a/src/rc/_usage.c
+++ b/src/rc/_usage.c
@@ -27,7 +27,7 @@
 #if lint
 # define _noreturn
 #endif
-#if __GNUC__ > 2 || defined(__INTEL_COMPILER)
+#if __GNUC__ > 2 || defined(__INTEL_COMPILER) || defined(__PCC__)
 # define _noreturn __attribute__ ((__noreturn__))
 #endif