Re: /usr/bin/ld: cannot find -lXext

[Goswin von Brederlow <goswin-v-b@web.de>]

Alasdair <alisys@btinternet.com> writes:

> On Sat, 2010-10-02 at 16:17 +0200, Francesco Pietra wrote:
>> While gcc compiling a complex program (AmberTools of Amber suite, a
>> molecular dynamics package) on amd64 lenny (in the past it compiled
>> smoothly on this system):
>> 
>> ./configure_at gcc
>> make -f Makefile_at
>> 
>> After a lot of compiled packages, I am getting the error
>> 
>> ******************
>> make[3]: Entering directory `/usr/local/amber10/src/leap/src/leap'
>> gcc  -o teLeap basics.o sysdepend.o stringExtra.o varArray.o getline.o
>> avl.o pdb_format.o pdb_read.o pdb_sprntf.o  pdb_sscanf.o pdb_write.o
>> vector.o zMatrix.o sort.o bag.o hash.o  dictionary.o database.o
>> nVector.o ring.o matrix.o fortran.o displayer.o assoc.o atom.o
>> byteArray.o  collection.o container.o internal.o list.o loop.o
>> molecule.o  oDouble.o oInteger.o oString.o objekt.o parmSet.o
>> residue.o unit.o unitio.o tripos.o graphUtil.o select.o amber.o
>> build.o elements.o library.o chirality.o minimizer.o model.o parmLib.o
>> pdbFile.o mol2File.o tools.o variables.o parser.o help.o helptext.o
>> octree.o commands.o mathop.o block.o restraint.o hybrid.o tLeap.o -lm
>> gcc  -o xaLeap basics.o sysdepend.o stringExtra.o varArray.o getline.o
>> avl.o pdb_format.o pdb_read.o pdb_sprntf.o  pdb_sscanf.o pdb_write.o
>> vector.o zMatrix.o sort.o bag.o hash.o  dictionary.o database.o
>> nVector.o ring.o matrix.o fortran.o displayer.o assoc.o atom.o
>> byteArray.o  collection.o container.o internal.o list.o loop.o
>> molecule.o  oDouble.o oInteger.o oString.o objekt.o parmSet.o
>> residue.o unit.o unitio.o tripos.o graphUtil.o select.o amber.o
>> build.o elements.o library.o chirality.o minimizer.o model.o parmLib.o
>> pdbFile.o mol2File.o tools.o variables.o parser.o help.o helptext.o
>> octree.o commands.o mathop.o block.o restraint.o hybrid.o xTank.o
>> xAction.o x3d.o xBasics.o  xaLeapc.o xaUnitEditor.o xaTable.o
>> xaAtomTable.o  XrawRegistr.o xaCommand.o xaTools.o  xaAtomParmTable.o
>> xaBondParmTable.o  xaAngleParmTable.o xaParmEditor.o
>> xaTorsionParmTable.o xaImproperParmTable.o  xaHBondParmTable.o
>> ../Xraw/libXaw.a ../Wc/libWcLeap.a ../Xpm/libXpm.a ../Xmu/libXmu.a
>> -L/usr/X11R6/lib64 -L/usr/X11R6/lib -lXt -lXext -lSM -lICE -lX11 -lXau
>> -lXdmcp -lm -lpthread
>> /usr/bin/ld: cannot find -lXext
>> collect2: ld returned 1 exit status
>> make[3]: *** [xaLeap] Error 1
>> make[3]: Leaving directory `/usr/local/amber10/src/leap/src/leap'
>> make[2]: *** [install_xleap] Error 2
>> make[2]: Leaving directory `/usr/local/amber10/src/leap'
>> make[1]: *** [install] Error 2
>> make[1]: Leaving directory `/usr/local/amber10/src/leap'
>> make: *** [install] Error 2
>> tya64:/usr/local/amber10/src#
>> ****************
>> 
>> Info:
>> 
>> francesco@tya64:~$ apt-file search libXext
>> ia32-libs: /emul/ia32-linux/usr/lib/libXext.so
>> ia32-libs: /emul/ia32-linux/usr/lib/libXext.so.6
>> ia32-libs: /emul/ia32-linux/usr/lib/libXext.so.6.4.0
>> libxext-dev: /usr/lib/libXext.a
>> libxext-dev: /usr/lib/libXext.so
>> libxext6: /usr/lib/libXext.so.6
>> libxext6: /usr/lib/libXext.so.6.4.0
>> libxext6-dbg: /usr/lib/debug/usr/lib/libXext.so.6.4.0
>> lsb-build-base3: /usr/lib/lsb3/libXext.so
>> francesco@tya64:~$
>> 
>> tya64:/home/francesco# ldconfig -v | grep "libXext"
>> 	libXext.so.6 -> libXext.so.6.4.0
>> 	libXext.so.6 -> libXext.so.6.4.0
>> tya64:/home/francesco#
>> 
>> I am confused how to turnaround the problem. Thanks for help. francesco pietra
>
>
> check to see /usr/bin/ld is sym-linked to ld.gold;
> if so change the link to ld->ld.bfd
>
> Here, for instance ld.gold will not find libraries in /usr/local/lib64
>
> Hope ths helps,
>
> Kind regards, Alasdair

You also need to explicitly check that you have the *.so links. The
ldconfig/ld.so.cache is not used for -l options, only for libraries
linked indirectly through other libraries.

You need libxext-dev installed.

MfG
        Goswin