[INFO ] Installing final compiler
[EXTRA] Configuring gcc
[EXTRA] Building gcc
[ERROR] /home/dell/crosstool-ng/build/.build/src/gcc-4.3.4/gcc/toplev.c:545:1: error: redefinition of 'floor_log2'
[ERROR] /home/dell/crosstool-ng/build/.build/src/gcc-4.3.4/gcc/toplev.c:580:1: error: redefinition of 'exact_log2'
[ERROR] make[2]: *** [toplev.o] Error 1
[ERROR] make[1]: *** [all-gcc] Error 2
[ERROR]
[ERROR] >>
[ERROR] >> Build failed in step 'Installing final compiler'
[ERROR] >> called in step '(top-level)'
[ERROR] >>
[ERROR] >> Error happened in: CT_DoExecLog[scripts/functions@257]
[ERROR] >> called from: do_cc_core_backend[scripts/build/cc/gcc.sh@460]
[ERROR] >> called from: do_cc_for_host[scripts/build/cc/gcc.sh@570]
[ERROR] >> called from: main[scripts/crosstool-NG.sh@632]
[ERROR] >>
[ERROR] >> For more info on this error, look at the file: 'build.log'
[ERROR] >> There is a list of known issues, some with workarounds, in:
[ERROR] >> '/home/dell/crosstool-ng/share/doc/crosstool-ng/ct-ng.1.19.0/B - Known issues.txt'
[ERROR]
[ERROR] (elapsed: 4:04.65)
[04:05] / /home/dell/crosstool-ng/bin/ct-ng:148: recipe for target 'build' failed
make: *** [build] Error 2
Ubuntu 16.04.2 LTS