Index: noto-emoji-c05b4b47c8250ccd232780cae46d66a8179e77ab/Makefile
===================================================================
--- noto-emoji-c05b4b47c8250ccd232780cae46d66a8179e77ab.orig/Makefile
+++ noto-emoji-c05b4b47c8250ccd232780cae46d66a8179e77ab/Makefile
@@ -16,10 +16,10 @@ EMOJI = NotoColorEmoji
 EMOJI_WINDOWS = NotoColorEmoji_WindowsCompatible
 all: $(EMOJI).ttf $(EMOJI_WINDOWS).ttf
 
-CFLAGS = -std=c99 -Wall -Wextra `pkg-config --cflags --libs cairo`
+CFLAGS = $(OPT_CFLAGS) -Wextra `pkg-config --cflags --libs cairo`
 LDFLAGS = -lm `pkg-config --libs cairo`
 
-PNGQUANT = pngquant
+PNGQUANT = /usr/bin/pngquant
 PYTHON = python3
 PNGQUANTFLAGS = --speed 1 --skip-if-larger --quality 85-95 --force
 BODY_DIMENSIONS = 136x128
@@ -88,9 +88,9 @@ ifeq (,$(shell which $(ZOPFLIPNG)))
   endif
 endif
 
-ifndef VIRTUAL_ENV
-  MISSING_VENV = fail
-endif
+#ifndef VIRTUAL_ENV
+#  MISSING_VENV = fail
+#endif
 
 ifeq (, $(shell which $(VS_ADDER)))
   MISSING_PY_TOOLS = fail