Override CFLAGS in Makefile
#!/bin/bash
LDFLAGS="$LDFLAGS -L$PREFIX/lib"
+CFLAGS="$CFLAGS -O3 -I$PREFIX/include"
-make -j$CPU_COUNT LDFLAGS="$LDFLAGS"
+make -j$CPU_COUNT LDFLAGS="$LDFLAGS" CFLAGS="$CFLAGS"
make test
cp pigz unpigz $PREFIX/bin
