Description of problem:
There's a missing -L/lib/lib64 somewhere:
creating libhplip-api.la
(cd .libs && rm -f libhplip-api.la && ln -s ../libhplip-api.la libhplip-api.la)
/bin/sh ./libtool --tag=CC --mode=link gcc  -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4
-m64 -mtune=generic   -o libsane-hpaio.la -rpath /usr/lib64 -version-info 1:0:0
 libsane_hpaio_la-hpaio.lo libsane_hpaio_la-mfpdtf.lo libsane_hpaio_la-pml.lo
libsane_hpaio_la-scl.lo libsane_hpaio_la-io.lo libsane_hpaio_la-common.lo
libsane_hpaio_la-soap_stub.lo libhpip.la libhplip-api.la -lsane -lnetsnmp -lm
-lcups -lusb -lcrypto -lpthread 
gcc -shared  .libs/libsane_hpaio_la-hpaio.o .libs/libsane_hpaio_la-mfpdtf.o
.libs/libsane_hpaio_la-pml.o .libs/libsane_hpaio_la-scl.o
.libs/libsane_hpaio_la-io.o .libs/libsane_hpaio_la-common.o
.libs/libsane_hpaio_la-soap_stub.o -Wl,--whole-archive ./.libs/libhplip-api.a
-Wl,--no-whole-archive  -Wl,--rpath
-Wl,/home/build/rebuild/build/hplip-1.7.2-8.fc7.src.rpm/hplip-1.7.2/.libs
-Wl,--rpath -Wl,/usr/lib64 ./.libs/libhpip.so -lsane -lnetsnmp -lm -lcups -lusb
-lcrypto -lpthread  -m64 -mtune=generic -Wl,-soname -Wl,libsane-hpaio.so.1 -o
.libs/libsane-hpaio.so.1.0.0
/usr/bin/ld: skipping incompatible /usr/lib/libsane.so when searching for -lsane
/usr/bin/ld: cannot find -lsane

Version-Release number of selected component (if applicable):
hplip-1.7.2-8.fc7