Hi, I am trying to build gcc 4.9.2 on mac OSX 10.10.1 from scratch but it fails at the configure step. On quick search I found that there is some issue with the configure script at below line : >> configure:5990: checking for version 0.12 of ISL It uses the value for the previous step which basically checks for ISL version 0.10 and 0.11 and doesn't update the value. Though I thought that was fixed. Any suggestion? Thanks, Hemant #################################### Hemants-MacBook-Pro:build hemant$ ../configure --prefix=/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2 --enable-checking=release --with-gmp=/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2 --with-mpfr=/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2 --with-mpc=/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2 --enable-languages=c,c++ --with-isl=/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2 --with-cloog=/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2 --program-suffix=-4.9.2 checking build system type... x86_64-apple-darwin14.0.0 checking host system type... x86_64-apple-darwin14.0.0 checking target system type... x86_64-apple-darwin14.0.0 checking for a BSD-compatible install... /usr/bin/install -c checking whether ln works... yes checking whether ln -s works... yes checking for a sed that does not truncate output... /usr/bin/sed checking for gawk... no checking for mawk... no checking for nawk... no checking for awk... awk checking for libatomic support... yes checking for libcilkrts support... yes checking for libitm support... yes checking for libsanitizer support... yes checking for libvtv support... no checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for g++... g++ checking whether we are using the GNU C++ compiler... yes checking whether g++ accepts -g... yes checking whether g++ accepts -static-libstdc++ -static-libgcc... no checking for gnatbind... no checking for gnatmake... no checking whether compiler driver understands Ada... no checking how to compare bootstrapped objects... cmp --ignore-initial=16 $$f1 $$f2 checking for objdir... .libs checking for the correct version of gmp.h... yes checking for the correct version of mpfr.h... yes checking for the correct version of mpc.h... yes checking for the correct version of the gmp/mpfr/mpc libraries... yes checking for version 0.10 of ISL... no checking for version 0.11 of ISL... no checking for version 0.12 of ISL... no configure: error: Unable to find a usable ISL. See config.log for details. ######################################################### config.log >> configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "" | #define PACKAGE_TARNAME "" | #define PACKAGE_VERSION "" | #define PACKAGE_STRING "" | #define PACKAGE_BUGREPORT "" | #define PACKAGE_URL "" | #define LT_OBJDIR ".libs/" | /* end confdefs.h. */ | #include <isl/version.h> | #include <string.h> | int | main () | { | if (strncmp (isl_version (), "isl-0.11", strlen ("isl-0.11")) != 0) | return 1; | | ; | return 0; | } configure:5970: result: no configure:5990: checking for version 0.12 of ISL configure:6009: gcc -o conftest -g -O2 -I/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2/include -I/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2/include -I/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2/include -I/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2/include -L/Users/hemant/Work/dvlpr/tools/gnu_tools_dir/usr/gcc-4.9.2/lib conftest.c -lisl >&5 configure:6009: $? = 0 configure:6009: ./conftest configure:6009: $? = 1 configure: program exited with status 1 configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "" | #define PACKAGE_TARNAME "" | #define PACKAGE_VERSION "" | #define PACKAGE_STRING "" | #define PACKAGE_BUGREPORT "" | #define PACKAGE_URL "" | #define LT_OBJDIR ".libs/" | /* end confdefs.h. */ | #include <isl/version.h> | #include <string.h> | int | main () | { | if (strncmp (isl_version (), "isl-0.12", strlen ("isl-0.12")) != 0) | return 1; | | ; | return 0; | } configure:6018: result: no configure:6054: error: Unable to find a usable ISL. See config.log for details. ####################################################