diff --git a/srcpkgs/boomerang/template b/srcpkgs/boomerang/template
index 4db52c3309e..904e0e8571f 100644
--- a/srcpkgs/boomerang/template
+++ b/srcpkgs/boomerang/template
@@ -20,6 +20,12 @@ case "$XBPS_TARGET_MACHINE" in
 	ppc*) broken="BinaryFile.h:45:5: error: expected unqualified-id before numeric constant"
 esac
 
+pre_configure() {
+	# Fails to build w/ qt5-5.15.0 because of deprecated functions warnings
+	vsed -i cmake-scripts/boomerang-flags.cmake \
+		-e "s;-Werror;;"
+}
+
 post_install() {
 	vlicense LICENSE.TERMS
 	rm ${DESTDIR}/usr/share/boomerang/LICENSE.TERMS