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When I am trying to install a openvpn from a tarball , following error occurs

checking whether the C compiler works... no
configure: error: in `/home/shubhamd/Downloads/openvpn-2.3.2': configure: error: C compiler cannot create executables

See `config.log' for more details

and the config.log is as follows :

 This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. It was created by OpenVPN configure 2.3.2, which was generated by GNU Autoconf 2.69. Invocation command line was $ ./configure ## --------- ## ## Platform. ## ## --------- ## hostname = shubhamd uname -m = x86_64 uname -r = 3.11.0-12-generic uname -s = Linux uname -v = #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 /usr/bin/uname -p = unknown /bin/uname -X = unknown /bin/arch = unknown /usr/bin/arch -k = unknown /usr/convex/getsysinfo = unknown /usr/bin/hostinfo = unknown /bin/machine = unknown /usr/bin/oslevel = unknown /bin/universe = unknown PATH: /usr/local/sbin PATH: /usr/local/bin PATH: /usr/sbin PATH: /usr/bin PATH: /sbin PATH: /bin PATH: /usr/games PATH: /usr/local/games ## ----------- ## ## Core tests. ## ## ----------- ## configure:2873: checking for a BSD-compatible install configure:2941: result: /usr/bin/install -c configure:2952: checking whether build environment is sane configure:3002: result: yes configure:3143: checking for a thread-safe mkdir -p configure:3182: result: /bin/mkdir -p configure:3195: checking for gawk configure:3211: found /usr/bin/gawk configure:3222: result: gawk configure:3233: checking whether make sets $(MAKE) configure:3255: result: yes configure:3339: checking build system type configure:3353: result: x86_64-unknown-linux-gnu configure:3373: checking host system type configure:3386: result: x86_64-unknown-linux-gnu configure:3418: checking for style of include used by make configure:3446: result: GNU configure:3517: checking for gcc configure:3533: found /usr/bin/gcc configure:3544: result: gcc configure:3773: checking for C compiler version configure:3782: gcc --version >&5 gcc (Ubuntu/Linaro 4.8.1-10ubuntu8) 4.8.1 Copyright (C) 2013 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. configure:3793: $? = 0 configure:3782: gcc -v >&5 Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.8.1-10ubuntu8' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8) configure:3793: $? = 0 configure:3782: gcc -V >&5 gcc: error: unrecognized command line option '-V' gcc: fatal error: no input files compilation terminated. configure:3793: $? = 4 configure:3782: gcc -qversion >&5 gcc: error: unrecognized command line option '-qversion' gcc: fatal error: no input files compilation terminated. configure:3793: $? = 4 configure:3813: checking whether the C compiler works configure:3835: gcc conftest.c >&5 /usr/bin/ld: cannot find crt1.o: No such file or directory /usr/bin/ld: cannot find crti.o: No such file or directory /usr/bin/ld: cannot find -lc /usr/bin/ld: cannot find crtn.o: No such file or directory collect2: error: ld returned 1 exit status configure:3839: $? = 1 configure:3877: result: no configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "OpenVPN" | #define PACKAGE_TARNAME "openvpn" | #define PACKAGE_VERSION "2.3.2" | #define PACKAGE_STRING "OpenVPN 2.3.2" | #define PACKAGE_BUGREPORT "[email protected]" | #define PACKAGE_URL "" | #define OPENVPN_VERSION_RESOURCE 2,3,2,0 | #define PACKAGE "openvpn" | #define VERSION "2.3.2" | /* end confdefs.h. */ | | int | main () | { | | ; | return 0; | } configure:3882: error: in `/home/shubhamd/Downloads/openvpn-2.3.2': configure:3884: error: C compiler cannot create executables See `config.log' for more details

How to fix the error ?

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  • What is the output from which gcc and from file $(which gcc) ? Commented Jan 7, 2014 at 19:13
  • which gcc gives /usr/bin/gcc and file $(which gcc) gives /usr/bin/gcc: symbolic link to 'gcc-4.8' Commented Jan 7, 2014 at 19:18
  • I asked because similar questions like this onen gave the same error when GCC was not the actual compuer or when there are some linker problems (roadmr already covered that part). Commented Jan 7, 2014 at 19:20

1 Answer 1

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6

It's likely you need to install the libc6-dev package. The errors you see indicate the linker (ld) is unable to link against the C library (and the object files it mentions, crt1.o for example, are part of this package).

I suggest you do sudo apt-get install build-essential, it will install, well, the essential tools and packages for basic builds to work. build-essential is a meta-package, which doesn't install any files of its own but depends on the required packages, so it's a safe bet to install it.

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  • should I install both libc6-dev and build-essential packages ? Commented Jan 7, 2014 at 19:32
  • just install build-essential, it will cause libc6-dev to be installed. The advantage of installing build-essential is that it will also take care of installing any additional packages you may be missing. Commented Jan 7, 2014 at 20:24
  • I had similar issues trying to compile diffutils-3.3 on Ubuntu 1204.5 Clearly a rookie mistake on my part trying to compile software on a USB stick meant for simple troubleshooting. Commented Apr 24, 2015 at 22:10

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