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Dear,I encountered some issue with the C-compiler (gcc) while installing a program. It says that it cannot create executables and then crash the process.Here is the full message i get :-------(...)cd spglib-1.5.2;\ ./configure FC=gfortran CC=gcc CFLAGS=-fopenmp FCFLAGS=-fopenmp;\ cd /Users/Gagriel/bandup-master2/src/externalchecking for a BSD-compatible install... /usr/bin/install -cchecking whether build environment is sane... yeschecking for a thread-safe mkdir -p... ./install-sh -c -dchecking for gawk... nochecking for mawk... nochecking for nawk... nochecking for awk... awkchecking whether make sets $(MAKE)... yeschecking for gcc... gccchecking whether the C compiler works... noconfigure: error: in `/Users/Gagriel/bandup-master2/src/external/spglib-1.5.2':configure: error: C compiler cannot create executablesSee `config.log' for more detailscd spglib-1.5.2;\ /Applications/Xcode.app/Contents/Developer/usr/bin/make -j --max-load 2.5;\ cd /Users/Gagriel/bandup-master2/src/externalmake[1]: *** No targets specified and no makefile found. Stop.----------Here are the versions of the softwares i used :-MacOs Hight-Sierra (10.13.6)-Xcode (10.1)And for the gcc :------Gagriel$ gcc --versionConfigured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1Apple LLVM version 10.0.0 (clang-1000.11.45.5)Target: x86_64-apple-darwin17.7.0Thread model: posixInstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin-------Here is also the problem pointed in the config.log file :------(....)Apple LLVM version 10.0.0 (clang-1000.11.45.5)Target: x86_64-apple-darwin17.7.0Thread model: posixInstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/binconfigure:3033: $? = 0configure:3022: gcc -V >&5clang: error: argument to '-V' is missing (expected 1 value)clang: error: no input filesconfigure:3033: $? = 1(....)--------I looked after some solutions on the internet without finding a suitable answer.As my problem is very similar to the one encountered by another user, i also link you his issue posted on an Homebrew forum... but without satisfying resolution (https://github.com/Homebrew/homebrew-core/issues/32339).I already tried a variety of methods (such as install/reinstall Xcode ; check the upgrades of every softwares involved; set the command line tool in Xcode; accept the Xcode licence; redo all the operations on a MacOS mojave 10.14.6 with higher versions of everything ...) and i am stuck with the exact same error.Does someone know anything about this ?Thanks for your helpBest,Gabriel Closset