What exactly am i looking for? I went through the libstdc++-v3/config.log and it basically said all the same stuff as i posted previously. I'll post a little of it below: configure:79692: result: no configure:79696: checking float.h presence configure:79706: /stareast/Network_Processor_Project/SnapGear_cd/tools/arm-linux/gcc-3.4.4/arm-linux/gcc/xgcc -B/stareast/Network_Processor_Project/SnapGear_cd/tools/arm-linux/gcc-3.4.4/arm-linux/gcc/ -B/opt/tools/arm-linux/arm-linux/bin/ -B/opt/tools/arm-linux/arm-linux/lib/ -isystem /opt/tools/arm-linux/arm-linux/include -isystem /opt/tools/arm-linux/arm-linux/sys-include -E -O2 -g -O2 conftest.c configure:79712: $? = 0 configure:79732: result: yes configure:79745: WARNING: float.h: present but cannot be compiled configure:79747: WARNING: float.h: check for missing prerequisite headers? configure:79749: WARNING: float.h: see the Autoconf documentation configure:79751: WARNING: float.h: section "Present But Cannot Be Compiled" configure:79753: WARNING: float.h: proceeding with the preprocessor's result configure:79755: WARNING: float.h: in the future, the compiler will take precedence configure:79767: checking for float.h configure:79774: result: yes configure:79642: checking for endian.h configure:79647: result: no configure:79642: checking for inttypes.h configure:79647: result: no configure:79651: checking locale.h usability configure:79663: /stareast/Network_Processor_Project/SnapGear_cd/tools/arm-linux/gcc-3.4.4/arm-linux/gcc/xgcc -B/stareast/Network_Processor_Project/SnapGear_cd/tools/arm-linux/gcc-3.4.4/arm-linux/gcc/ -B/opt/tools/arm-linux/arm-linux/bin/ -B/opt/tools/arm-linux/arm-linux/lib/ -isystem /opt/tools/arm-linux/arm-linux/include -isystem /opt/tools/arm-linux/arm-linux/sys-include -c -O2 -g -O2 -O2 -g -O2 conftest.c >&5 conftest.c:16:19: stdio.h: No such file or directory conftest.c:50:20: locale.h: No such file or directory configure:79669: $? = 1 configure: failed program was: | /* confdefs.h. */ ..etc and eventually: configure:79732: result: no configure:79767: checking for locale.h configure:79774: result: no configure:79642: checking for float.h configure:79647: result: yes configure:79642: checking for stdint.h configure:79647: result: no configure:79904: checking for main in -lm configure:79912: error: Link tests are not allowed after GCC_NO_EXECUTABLES. I really dont understand this error?? Is it possibly related to uClib? I have this feeling that Buildroot may have messed up my uClib configuration - although I dont see how that will affect this?