Worked on CI tests

Author: joachimmetz

appveyor.yml

@@ -124,7 +124,7 @@ install:
 - cmd: if [%BUILD_ENVIRONMENT%]==[cygwin64] (
     C:\cygwin64\setup-x86_64.exe -qgnNdO -l C:\cygwin64\var\cache\setup -R c:\cygwin64 -s http://cygwin.mirror.constant.com -P gettext-devel -P wget )
 - cmd: if [%BUILD_ENVIRONMENT%]==[mingw-w64] (
-    C:\msys64\usr\bin\pacman -S --noconfirm --needed autoconf automake gettext-devel libtool make mingw-w64-x86_64-gcc )
+    C:\msys64\usr\bin\pacman -S --noconfirm --needed autoconf automake gettext-devel libtool make mingw-w64-x86_64-gcc pkg-config )
 - ps: If ( ( "cygwin64-gcc-no-optimization", "mingw-w64-gcc-no-optimization" ).Contains( $env:TARGET ) ) {
     $ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe -Outfile ..\codecov.exe }