clang doesn't support -pie option (as of clang 3.3): clang: error: argument unused during compilation: '-pie' [-Werror,-Wunused-command-line-argument] We have to use -Wl,-pie instead. (ref. https://bugs.ruby-lang.org/issues/5697) The new code checks -pie first, and if it fails, checks -Wl,-pie next. By doing so, we can handle both cases. The patch is tested on Mac OS X 10.8.5 and Fedora 19. Signed-off-by: Ryota Ozaki <ozaki.ryota(a)gmail.com&gt; --- m4/virt-compile-pie.m4 | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/m4/virt-compile-pie.m4 b/m4/virt-compile-pie.m4 index cceb495..11cf0af 100644 --- a/m4/virt-compile-pie.m4 +++ b/m4/virt-compile-pie.m4 @@ -27,7 +27,14 @@ AC_DEFUN([LIBVIRT_COMPILE_PIE],[ *) gl_COMPILER_OPTION_IF([-fPIE -DPIE], [ PIE_CFLAGS="-fPIE -DPIE" - PIE_LDFLAGS="-pie" + gl_COMPILER_OPTION_IF(["-pie"], [ + PIE_LDFLAGS="-pie" + ], [ + dnl clang requires -Wl,-pie instead of -pie + gl_COMPILER_OPTION_IF(["-Wl,-pie"], [ + PIE_LDFLAGS="-Wl,-pie" + ]) + ]) ]) esac AC_SUBST([PIE_CFLAGS]) -- 1.8.4