--- a/libgsmfr2/Makefile	Fri May 10 19:50:29 2024 +0000
+++ b/libgsmfr2/Makefile	Fri May 10 23:04:44 2024 +0000
@@ -7,7 +7,6 @@
 LIB=	libgsmfr2.a
 
 include ../config.defs
-INSTALL_PREFIX=${DESTDIR}${PREFIX}
 
 all:	${LIB}
 
@@ -18,10 +17,10 @@
 	ranlib $@
 
 install:
-	mkdir -p ${INSTALL_PREFIX}/include
-	install -c -m 444 tw_gsmfr.h ${INSTALL_PREFIX}/include
-	mkdir -p ${INSTALL_PREFIX}/lib
-	install -c -m 444 ${LIB} ${INSTALL_PREFIX}/lib
+	mkdir -p ${DESTDIR}${includedir}
+	install -c -m 444 tw_gsmfr.h ${DESTDIR}${includedir}
+	mkdir -p ${DESTDIR}${libdir}
+	install -c -m 444 ${LIB} ${DESTDIR}${libdir}
 
 clean:
 	rm -f *.[oa] errs