I am compiling GCC 9.3.0 under FreeBSD 12.3 (i386). It is OK when I type ./configure, but when I type gmake (BSD make is different from GNU Make, so I fetch one by typing pkg install gmake which is GNU make), the program throws the error output:



Therefore, I serched in Makefile for line 991, 18047, and 23357. They are the same command which is:

@r='${PWD_COMMAND}'; export r; \

After I saw the complaint of linker, I guess the error is because the Makefile didn't make the linker find libc.so. (By the way, this file is under /usr/lib directory.)

Overall, can I modify the command or the Makefile by some means to solve this problem?

In theory, the Makefile can be modified manually, but this one apparently was generated by Automake:
https://en.wikipedia.org/wiki/Automake

So, the Makefile.am, from which the Makefile was generated, would be the proper place to fix the problem...

See also:
https://stackoverflow.com/a/2531841

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Also, often you can give the ./configure script additional parameters. Try something like:
./configure --extra-ldflags="-L/path/to/extra/lib"

BTW: Another possible reason why linking "libc" can fail is when the linker is trying to link static C library, but your system only has the shared one available? Either that, or the architecture doesn't match.

Do you specifically need gcc-9.3? Will 9.4 do? If so:

You can pass in compiler/linker flags on the command-line:

@kigar64551 @kbw

Thanks for answering!