diff --git a/science/pnetcdf/Portfile b/science/pnetcdf/Portfile
index 56244a76007..dda933eeccd 100644
--- a/science/pnetcdf/Portfile
+++ b/science/pnetcdf/Portfile
@@ -42,6 +42,9 @@ if {${os.platform} eq "darwin" && ${os.arch} eq "powerpc"} {
 compiler.blacklist-append \
                         {clang < 500} {*gcc-[34].*} {macports-gcc-[56]}
 
+# Avoid duplicate LC_RPATH.
+compilers.add_gcc_rpath_support no
+
 depends_build-append    port:autoconf \
                         port:automake \
                         port:libtool \