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Build failure for lang/gcc9 on Linux
I'm attempting to build lang/gcc9 from the 2020Q4 release on Linux. Specifically, I've tried on SLES 15, RHEL 7, and CentOS 7. The failure is identical on all three platforms.
It appears as if /usr/include/dlfcn.h is not being included. Various symbols, such as RTLD_NOW, dlerror, and dlsym are not declared.
The problem is isolated to lang/gcc9; I am able to build both lang/gcc8 and lang/gcc10 on these platforms. Admittedly, I have to add --without-zstd to CONFIGURE_ARGS for RHEL/CentOS, but that is a separate issue.
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