gcc     -L/usr/local/dept/lib \
        -shared \
        -O2 \
        -g \
        -pipe \
        -Wall \
        -Wp,-D_FORTIFY_SOURCE=2 \
        -fexceptions \
        -fstack-protector \
        --param=ssp-buffer-size=4 \
        -m64 \
        -mtune=generic Sybase.o dbdimp.o \
        -o blib/arch/auto/DBD/Sybase/Sybase.so 

##</code><code>##

$ sh -x relink && readelf -d blib/arch/auto/DBD/Sybase/Sybase.so | grep -i rpath
+ gcc -L/usr/local/dept/lib -Wl,-R/usr/local/dept/lib -shared -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic Sybase.o dbdimp.o -o blib/arch/auto/DBD/Sybase/Sybase.so
 0x000000000000000f (RPATH)              Library rpath: [/usr/local/dept/lib]


##</code><code>##

$ perl Makefile.PL PREFIX=$DEPT/perl LDDLFLAGS=-Wl,-R$DEPT/lib < answers && rm -f nohup.out && nohup make || grep ^gcc nohup.out | tail -1
Unknown Client Library version - assuming FreeTDS.
...
Writing Makefile for DBD::Sybase
nohup: appending output to `nohup.out'
gcc  -Wl,-R/usr/local/dept/lib Sybase.o dbdimp.o  -o blib/arch/auto/DBD/Sybase/Sybase.so