Are you running from sh/bash/ksh/csh/zsh, or maybe, Python's os.system()? There is a bug in gmp's configure, related to flex, and revealed by non-default signal handling such as in Python. It has been reported for years, by multiple people, with simple correct fixes, but not fixed. - Jay On Apr 17, 2014, at 2:38 AM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 17 April 2014 10:12, Vladimír Fuka wrote: >> >> Nevertheless I always get this in some internal `configure` after >> running `make`: >> >> checking for bison... bison -y >> checking for flex... flex >> checking lex output file root... configure: error: cannot find >> output from flex; giving up >> make[2]: *** [configure-stage1-gmp] Error 1 >> make[2]: Leaving directory `***/gcc-bin-8' >> make[1]: *** [stage1-bubble] Error 2 >> make[1]: Leaving directory `***/gcc-bin-8' >> make: *** [all] Error 2 >> >> It is configured with: >> >> ../gcc-4.8.2/configure --enable-languages=c,c++,fortran >> --prefix=/home/***/gcc-4.8.2 >> >> I have no idea what should I try more. > > You can look in gmp/config.log to see what causes the error. In a > successful log you should see something like: > > configure:29361: flex conftest.l > configure:29365: $? = 0 > configure:29367: checking lex output file root > configure:29381: result: lex.yy
