File obs-toolchain-fix.patch of Package sagemath

--- a/Makefile
+++ b/Makefile
@@ -2928,7 +2928,12 @@
 base-toolchain: $(SAGE_LOCAL)/var/lib/sage/installed/.dummy \
 	        $(SAGE_LOCAL)/var/lib/sage/doc/.dummy
-	touch /usr/var/lib/sage/installed/.dummy
+	@# OBS-sandbox: write under SAGE_LOCAL, not /usr
+	mkdir -p "$(SAGE_LOCAL)/var/lib/sage/installed"
+	touch "$(SAGE_LOCAL)/var/lib/sage/installed/.dummy"
 
-	rm -f /usr/lib/pkgconfig/blas.pc
-	ln -sf "$(PKG_CONFIG_PATH_OPENBLAS)/openblas.pc" "/usr/lib/pkgconfig/blas.pc"
+	@# OBS: skip pkgconfig hacks
+	@echo "Skipping /usr/lib/pkgconfig/* symlinks in OBS build"