ld cannot find -l library

Question

I am having trouble installing pyipopt on ubuntu 12 04   During linking  I receive the error     usr bin ld  cannot find -lcoinhsl   Even though I know that this library is installed and the  so and  la files are available in  home mostafa MyBuilds CoinIpopt build lib   does anyone have a solution for this   below is the complete return of running setup py build    root ubuntu   MyBuilds pyipopt  sudo python setup py build running build running build ext building  pyipopt  extension gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I usr lib python2 7 dist-packages numpy core include -I home mostafa MyBuilds CoinIpopt build include coin  -I usr include python2 7 -c src callback c -o build temp linux-x86 64-2 7 src callback o gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I usr lib python2 7 dist-packages numpy core include -I home mostafa MyBuilds CoinIpopt build include coin  -I usr include python2 7 -c src pyipopt c -o build temp linux-x86 64-2 7 src pyipopt o src pyipopt c  In function    set intermediate callback     src pyipopt c 452 15  warning  variable    myowndata    set but not used  -Wunused-but-set-variable  gcc -pthread -shared -Wl -O1 -Wl -Bsymbolic-functions -Wl -Bsymbolic-functions -Wl -z relrobuild temp linux-x86 64-2 7 src callback o build temp linux-x86 64-2 7 src pyipopt o -L home mostafa MyBuilds CoinIpopt build lib  -lipopt -lblas -lcoinhsl -lcoinmetis -llapack -ldl -lm -o build lib linux-x86 64-2 7 pyipopt so -Wl --rpath -Wl  home mostafa MyBuilds CoinIpopt build lib   usr bin ld  cannot find -lcoinhsl collect2  ld returned 1 exit status error  command  gcc  failed with exit status 1

User · Answer

-Ldir       Add directory dir to the list of directories to be searched for -l

User · Answer

I had a similar problem with another library and the reason why it didn t found it  was that I didn t run the make install  after running   configure and make  for that library  The make install may require root privileges  in this case use  sudo make install   After running the make install you should have the so files in the correct folder  i e  here  usr local lib and not in the folder mentioned by you

User · Answer

You may install your coinhsl library in one of your standard libraries directories and run  ldconfig  before doing your ppyipopt install

User · Answer

you can add the Path to coinhsl lib to LD LIBRARY PATH variable  May be that will help   export LD LIBRARY PATH  xx yy zz  LD LIBRARY PATH   where  xx yy zz represent the path to coinhsl lib

[gcc] ld cannot find -l<library>

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