title: unable to link Intel TBB library with libtbb in /usr/lib
body: <p>I downloaded the pre built headers and libraries for Intel TBB from Intel's TBB website. I updated ldconfig to add the tbb shared library to /usr/lib. However on compiling with -tbb the code using g++ ld returns -1 as it is unable to find libtbb </p>
  
  <p>libtbb.so.2 is present in /usr/lib/</p>
  
  <p>here is my full g++ output</p>
  
  <pre><code>g++ hellotbb.cpp  -o htbb -I$HOME/libs/tbb43/include  -v  -ltbb 
  
  Using built-in specs.
  COLLECT_GCC=g++
  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 4.8.2-19ubuntu1' --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 --disable-libmudflap --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 4.8.2 (Ubuntu 4.8.2-19ubuntu1) 
  COLLECT_GCC_OPTIONS='-o' 'htbb' '-I' '/home/govind/libs/tbb43/include' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
   /usr/lib/gcc/x86_64-linux-gnu/4.8/cc1plus -quiet -v -I /home/govind/libs/tbb43/include -imultiarch x86_64-linux-gnu -D_GNU_SOURCE hellotbb.cpp -quiet -dumpbase hellotbb.cpp -mtune=generic -march=x86-64 -auxbase hellotbb -version -fstack-protector -Wformat -Wformat-security -o /tmp/ccnjmEt3.s
  GNU C++ (Ubuntu 4.8.2-19ubuntu1) version 4.8.2 (x86_64-linux-gnu)
      compiled by GNU C version 4.8.2, GMP version 5.1.3, MPFR version 3.1.2-p3, MPC version 1.0.1
  GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
  ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/4.8"
  ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
  ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../x86_64-linux-gnu/include"
  #include "..." search starts here:
  #include &lt;...&gt; search starts here:
   /home/govind/libs/tbb43/include
   /usr/include/c++/4.8
   /usr/include/x86_64-linux-gnu/c++/4.8
   /usr/include/c++/4.8/backward
   /usr/lib/gcc/x86_64-linux-gnu/4.8/include
   /usr/local/include
   /usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed
   /usr/include/x86_64-linux-gnu
   /usr/include
  End of search list.
  GNU C++ (Ubuntu 4.8.2-19ubuntu1) version 4.8.2 (x86_64-linux-gnu)
      compiled by GNU C version 4.8.2, GMP version 5.1.3, MPFR version 3.1.2-p3, MPC version 1.0.1
  GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
  Compiler executable checksum: 26a7c0bd346d04102f6aea776e0cccc5
  COLLECT_GCC_OPTIONS='-o' 'htbb' '-I' '/home/govind/libs/tbb43/include' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
   as -v -I /home/govind/libs/tbb43/include --64 -o /tmp/ccC9Xpee.o /tmp/ccnjmEt3.s
  GNU assembler version 2.24 (x86_64-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2.24
  COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/
  LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../:/lib/:/usr/lib/
  COLLECT_GCC_OPTIONS='-o' 'htbb' '-I' '/home/govind/libs/tbb43/include' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
   /usr/lib/gcc/x86_64-linux-gnu/4.8/collect2 --sysroot=/ --build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro -o htbb /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/4.8 -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../.. /tmp/ccC9Xpee.o -ltbb -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/4.8/crtend.o /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o
  /usr/bin/ld: cannot find -ltbb
  collect2: error: ld returned 1 exit status
  </code></pre>
  
  <p>It seems that ld does not detect my tbb library in /usr/lib/</p>