--- a/check-all.sh	Fri Dec 19 13:47:50 2025 +0100
+++ b/check-all.sh	Fri Dec 19 14:06:21 2025 +0100
@@ -49,3 +49,4 @@
 # clean build files and restore config
 make clean > /dev/null
 mv config.mk.bak config.mk
+make check -j`nproc`