https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68347
--- Comment #2 from Alexey Rychkov <alexey.a.rychkov at gmail dot com> --- #define GFC_REAL_4_HUGE ^[[01;31m^[[K^[[m^[[K 3.40282347e38f #define GFC_REAL_4_LITERAL_SUFFIX f #define GFC_REAL_4_LITERAL(X) (X ## f) #define GFC_REAL_4_DIGITS ^[[01;31m^[[K^[[m^[[K 24 #define GFC_REAL_4_RADIX ^[[01;31m^[[K^[[m^[[K 2 ^[[01;31m^[[K#^[[m^[[Kifndef C99_PROTOS_H ^[[01;31m^[[K#^[[m^[[Kdefine C99_PROTOS_H 1 ^[[01;31m^[[K#^[[m^[[Kifndef HAVE_ACOSF ^[[01;31m^[[K#^[[m^[[Kdefine HAVE_ACOSF 1 ^[[01;31m^[[K#^[[m^[[Kendif The system is CentOS release 6.7 I did just this: cd gcc-5.2.0 mkdir build && cd build ../configure --disable-multilib make I'm not sure if this can affect something, but I was using tmux on top of ssh session...
