"/usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libX11.so when searching for -lX11" error when installing htk

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http://askubuntu.com – I was trying to install a library named htk. After downloading and extracting the source files, I run sudo LDFLAGS="-L /usr/lib/x86_64-linux-gnu" ./configure under the root directory of htk.Then I typed sudo make all and got this error: a - HModel.o a - HNet.o a - HParm.o a - HRec.o a - HShell.o a - HSigP.o a - HTrain.o a - HUtil.o a - HVQ.o a - HWave.o a - strarr.o ranlib HTKLib.a make[1]: Leaving directory `/home/rosfuerte/Desktop/hw2_1/htk/HTKLib' (cd HTKTools && make all) \ || case "" in *k*) fail=yes;; *) exit 1;; esac; make[1]: Entering directory `/home/rosfuer (HowTos)