我正在尝试在Mac OSX Catalina上编译程序，并且遇到以下错误：
[USER:~/Seisan/PRO]$make all
cd ../LIB; /Library/Developer/CommandLineTools/usr/bin/make all; cd ../PRO
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---- COMPILING SEISAN LIBRARIES -----------------
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gcc -m64 -c -I../INC -I/usr/X11R6/include -g -o xlib.o xlib.c
gcc: warning: couldn’t understand kern.osversion ‘19.2.0
In file included from xlib.c:44:0:
/usr/X11R6/include/X11/Xlib.h:38:23: fatal error: sys/types.h: No such file or directory
compilation terminated.
make[1]: *** [xlib.o] Error 1
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---- COMPILING SEISAN PROGRAMS -------------------
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make: *** No rule to make target `../LIB/./seisan.a', needed by `afadsei'. Stop.
运行which gcc时，我得到/usr/local/bin/gcc。我已经通过执行以下操作更新了Xcode：xcode-select --install。我已经安装了XQuartz。可能是什么问题？感谢您的帮助。