redo-ifchange $src conf/zstd.cflags.rc conf/zstd.libs.rc
read ZSTD_CFLAGS < conf/zstd.cflags.rc
read ZSTD_LIBS < conf/zstd.libs.rc
redo-ifchange $src conf/zstd.cflags.rc conf/zstd.libs.rc
read ZSTD_CFLAGS < conf/zstd.cflags.rc
read ZSTD_LIBS < conf/zstd.libs.rc