macports: fix the clang stdlib fix

packaging/macports/textproc/recoll/Portfile

@@ -21,9 +21,9 @@ long_description    Recoll is a desktop search tool based on Xapian
 homepage            http://www.recoll.org/
 master_sites        ${homepage}
 
-checksums           rmd160  88aebac6074f3e6242770348ac30e405975effa6 \
-                    sha256  500d114952aa03c222847df8ecd0f9c58fc1d03b940df72de81e02e52ca905bc \
-                    size 2849390
+checksums           rmd160  9ccf53ac498e937d37054727e963f57e341c539c \
+                    sha256  dcf74625a7148f04befd99706da8e7b26dab43a1092883abf5211422a15c5385 \
+                    size 2853970
 
 depends_lib         port:xapian-core \
                     port:aspell \
@@ -42,12 +42,15 @@ patchfiles          patch-sampleconf-mimeview.diff \
     patch-recoll-pro-stdlib.diff
 
 post-patch {
+    set clang_stdlib ""
+    
     if {[string match *clang* ${configure.compiler}]} {
         set clang_stdlib -stdlib=${configure.cxx_stdlib}
-        reinplace "s|@@STDLIB@@|${clang_stdlib}|g" qtgui/recoll.pro.in
     }
+    reinplace "s|@@STDLIB@@|${clang_stdlib}|g" qtgui/recoll.pro.in
 }
 
+
 # Note: this is probably not the right way to configure QMAKE
 configure.args      QMAKE=${prefix}/libexec/qt5/bin/qmake \
                     --without-x \