mock: failure on libtool dependecy

[zosrothko]

Hi

With the followin rpm.spec snippet

BuildRequires:    openssl-devel
BuildRequires:    libtool


building with mock -r default --rebuimypackage.src.rpm ends up in

/usr/bin/ld: cannot find -lltdl
/builddir/build/BUILD/poco-1.7.0-all/build/rules/exec:59: recipe for 
target 
'/builddir/build/BUILD/poco-1.7.0-all/Data/ODBC/testsuite/bin/Linux/x86_64/testrunner'

failed
collect2: error: ld returned 1 exit status


Did I miss something in the spec requirments?

zos