diff --git a/netpbm.spec b/netpbm.spec
index 48b1409..74b02a9 100644
--- a/netpbm.spec
+++ b/netpbm.spec
@@ -92,6 +92,7 @@ rm -rf converter/other/jpeg2000/libjasper/
 rm -rf converter/other/jbig/libjbig/
 
 %build
+%set_build_flags
 ./configure <<EOF
 
 
@@ -118,9 +119,9 @@ TOP=`pwd`
 
 make \
 	CC="%{__cc}" \
-	LDFLAGS="$RPM_LD_FLAGS -L$TOP/pbm -L$TOP/pgm -L$TOP/pnm -L$TOP/ppm" \
-	CFLAGS="$RPM_OPT_FLAGS -fPIC -flax-vector-conversions -fno-strict-aliasing" \
-	CFLAGS_CONFIG="$RPM_OPT_FLAGS" \
+	LDFLAGS="$LD_FLAGS -L$TOP/pbm -L$TOP/pgm -L$TOP/pnm -L$TOP/ppm" \
+	CFLAGS="$CFLAGS -fPIC -flax-vector-conversions -fno-strict-aliasing" \
+	CFLAGS_CONFIG="$CFLAGS" \
 	LADD="-lm" \
 	JPEGINC_DIR=%{_includedir} \
 	PNGINC_DIR=%{_includedir} \
@@ -230,6 +231,7 @@ popd
 %changelog
 * Tue Jun 28 2022 Josef Ridky <jridky@redhat.com> - 10.99.00-1
 - New upstream release 10.99.00 (#2068865)
+- Use %%set_build_flags to set environment variables
 
 * Sun Feb 13 2022 Josef Ridky <jridky@redhat.com> - 10.97.00-4
 - Bump spec for new jasper