qt_functions.prf: pass invalid file name to call perl

I'm trying to compile QtWebView.

After clone the repo, we try to compile with:

c:\Quati\develop\build\qt5.4\android_armv7\bin\qmake.exe -r -spec android-g++
Output:

Reading C:/Quati/develop/git/qtwebview/src/src.pro
Reading C:/Quati/develop/git/qtwebview/src/webview/webview.pro
Project MESSAGE: perl -w 'C:\quati\develop\build\qt5.4\android_armv7\bin\syncqt.pl' -check-includes -module QtWebView -version 5.4.0 -outdir C:/Quati/develop/git/qtwebview C:/Quati/develop/git/qtwebview
Can't open perl script "'C:\quati\develop\build\qt5.4\android_armv7\bin\syncqt.pl'": Invalid argument
Project ERROR: Failed to run: perl -w 'C:\quati\develop\build\qt5.4\android_armv7\bin\syncqt.pl' -check-includes -module QtWebView -version 5.4.0 -outdir C:/Quati/develop/git/qtwebview C:/Quati/develop/git/qtwebview

Changing the file qt_functions.prf, in line 198:

from
cmd = perl -w $$system_path($${cmd}.pl)
to
cmd = perl -w $${cmd}.pl

Running again, QMake runs fine:

Reading C:/Quati/develop/git/qtwebview/src/src.pro
Reading C:/Quati/develop/git/qtwebview/src/webview/webview.pro
Project MESSAGE: perl -w C:/quati/develop/build/qt5.4/android_armv7/bin/syncqt.pl -check-includes -module QtWebView -version 5.4.0 -outdir C:/Quati/develop/git/qtwebview C:/Quati/develop/git/qtwebview
<srcbase> = C:/Quati/develop/git/qtwebview
<outbase> = C:/Quati/develop/git/qtwebview
Reading C:/Quati/develop/git/qtwebview/src/imports/imports.pro
Reading C:/Quati/develop/git/qtwebview/src/jar/jar.pro
Reading C:/Quati/develop/git/qtwebview/src/jar/distributedjar.pro
Reading C:/Quati/develop/git/qtwebview/src/jar/bundledjar.pro
Reading C:/Quati/develop/git/qtwebview/examples/examples.pro
Reading C:/Quati/develop/git/qtwebview/examples/webview/webview.pro
Reading C:/Quati/develop/git/qtwebview/examples/webview/webview/webview.pro