diff --git a/lib/libusb/Makefile b/lib/libusb/Makefile
index 92c0843139bf..1ef85d4b6f50 100644
--- a/lib/libusb/Makefile
+++ b/lib/libusb/Makefile
@@ -38,6 +38,7 @@ SRCS+=		libusb10_io.c
 CFLAGS+=	-DCOMPAT_32BIT
 .endif
 
+.ifndef COMPAT_32BIT
 beforeinstall:
 	${INSTALL} -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
 		${.CURDIR}/libusb-0.1.pc ${DESTDIR}${LIBDATADIR}/pkgconfig
@@ -45,6 +46,7 @@ beforeinstall:
 		${.CURDIR}/libusb-1.0.pc ${DESTDIR}${LIBDATADIR}/pkgconfig
 	${INSTALL} -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
 		${.CURDIR}/libusb-2.0.pc ${DESTDIR}${LIBDATADIR}/pkgconfig
+.endif
 
 #
 # Cross platform support
diff --git a/lib/libz/Makefile b/lib/libz/Makefile
index 1b2fec59911a..1f9bb72bc527 100644
--- a/lib/libz/Makefile
+++ b/lib/libz/Makefile
@@ -68,9 +68,11 @@ test: example minigzip
 	(export LD_LIBRARY_PATH=. ; \
 		echo hello world | ./minigzip | ./minigzip -d )
 
+.ifndef COMPAT_32BIT
 beforeinstall:
 	${INSTALL} -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
 		${.CURDIR}/zlib.pc ${DESTDIR}${LIBDATADIR}/pkgconfig
+.endif
 
 .include <bsd.lib.mk>