0:38.27 configure: error: MacOS X 10.9 SDK or later is required
 0:38.31 DEBUG: <truncated - see config.log for full output>
 0:38.31 DEBUG: configure: failed program was:
 0:38.31 DEBUG: #line 10098 "configure"
 0:38.31 DEBUG: #include "confdefs.h"
 0:38.31 DEBUG: #include <linux/ethtool.h>
 0:38.31 DEBUG: int main() {
 0:38.31 DEBUG:  struct ethtool_cmd cmd; cmd.speed_hi = 0;
 0:38.31 DEBUG: ; return 0; }
 0:38.31 DEBUG: configure:10134: checking for CoreMedia/CoreMedia.h
 0:38.31 DEBUG: configure:10144: /nix/store/arq8wsxp7d1k8wv3qmdf6fs35vrlaq6a-Toolchains/XcodeDefault.xctoolchain/bin/clang -E -std=gnu99 -Qunused-arguments  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-strong conftest.c >/dev/null 2>conftest.out
 0:38.31 DEBUG: configure:10134: checking for VideoToolbox/VideoToolbox.h
 0:38.31 DEBUG: configure:10144: /nix/store/arq8wsxp7d1k8wv3qmdf6fs35vrlaq6a-Toolchains/XcodeDefault.xctoolchain/bin/clang -E -std=gnu99 -Qunused-arguments  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-strong conftest.c >/dev/null 2>conftest.out
 0:38.31 DEBUG: configure:10140:10: fatal error: 'VideoToolbox/VideoToolbox.h' file not found
 0:38.31 DEBUG: #include <VideoToolbox/VideoToolbox.h>
 0:38.31 DEBUG:          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 0:38.31 DEBUG: 1 error generated.
 0:38.31 DEBUG: configure: failed program was:
 0:38.31 DEBUG: #line 10139 "configure"
 0:38.31 DEBUG: #include "confdefs.h"
 0:38.31 DEBUG: #include <VideoToolbox/VideoToolbox.h>
 0:38.31 DEBUG: configure: error: MacOS X 10.9 SDK or later is required
 0:38.31 ERROR: old-configure failed
 0:38.36 *** Fix above errors and then restart with\
 0:38.36                "./mach build"
 0:38.37 make: *** [client.mk:115: configure] Error 1
builder for '/nix/store/y8ci4ijiza7kr1lm9lbvmhi1yhjn8cwj-firefox-unwrapped-67.0.drv' failed with exit code 2
cannot build derivation '/nix/store/8zn6ni9x2jgbqzrdpq3rk570dxksl1ar-Firefox-67.0.drv': 1 dependencies couldn't be built
error: build of '/nix/store/8zn6ni9x2jgbqzrdpq3rk570dxksl1ar-Firefox-67.0.drv' failed