If you have the GNU autoconf suite, you can generate the configure configuration file yourself from the configure.in file. After downloading PHP from the CVS server and installing it, run make -f build.mk in the root directory of PHP. (Similarly, unless you add the --enable-maintainer-mode option when running configure, configure will not be rebuilt when configure.in changes. Therefore, if you want to change configure.in, you must update it manually. A phenomenon when you run configure Or config.status, you can see that you can find some tags such as @VARIABLE@ in the Makefile)