File 01-lv2-make.patch of Package tunefish

--- src/tunefish4/LV2.mak.orig	2020-01-22 12:27:23.000000000 +1000
+++ src/tunefish4/LV2.mak	2020-06-29 16:15:40.544291707 +1000
@@ -26,3 +26,7 @@
 	../../generate-lv2-ttl.py $(JUCE_OUTDIR_LV2)/$(JUCE_TARGET_LV2)
 
 -include $(OBJECTS_LV2:%.o=%.d)
+
+check-pkg-config:
+	@command -v pkg-config >/dev/null 2>&1 || { echo >&2 "pkg-config not installed. Please, install it."; exit 1; }
+	@pkg-config --print-errors alsa freetype2 libcurl x11 xext xinerama