Added missing pkgconf package

.appveyor.yml

@@ -16,13 +16,14 @@ install:
 - cmd: |-
     set PATH=%QTDIR%\bin;%VCPKGDIR%\tools\protobuf;%PATH%
     call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat
+    vcpkg install pkgconf:x64-windows-static-md-release
     vcpkg install protobuf:x64-windows-static-md-release
     vcpkg install zlib:x64-windows-static-md-release
     copy /y %VCPKGDIR%\lib\zlib.lib %VCPKGDIR%\lib\zlibstatic.lib
 
 build_script:
 - cmd: |-
-    qmake PROTOBUF=%VCPKGDIR% ZLIB=%VCPKGDIR% pbfplugin.pro
+    qmake USE_PKGCONFIG=true pbfplugin.pro
     nmake release
 
 artifacts:

pbfplugin.pro

@@ -39,32 +39,45 @@ RESOURCES += pbfplugin.qrc
 
 DEFINES += QT_NO_DEPRECATED_WARNINGS
 
+equals(USE_PKGCONFIG, "true") {
+    CONFIG += link_pkgconfig
+    PKGCONFIG += protobuf-lite zlib
+}
+
 unix:!macx:!android {
-    LIBS += -lprotobuf-lite \
-        -lz
+    !equals(USE_PKGCONFIG, "true") {
+        LIBS += -lprotobuf-lite \
+                -lz
+    }
 
     target.path += $$[QT_INSTALL_PLUGINS]/imageformats
     INSTALLS += target
 }
 win32 {
-    INCLUDEPATH += $$PROTOBUF/include \
-        $$ZLIB/include
-    LIBS += $$PROTOBUF/lib/libprotobuf-lite.lib \
-        $$ZLIB/lib/zlibstatic.lib
+    !equals(USE_PKGCONFIG, "true") {
+        INCLUDEPATH += $$PROTOBUF/include \
+            $$ZLIB/include
+        LIBS += $$PROTOBUF/lib/libprotobuf-lite.lib \
+            $$ZLIB/lib/zlibstatic.lib
+    }
 
     QMAKE_TARGET_PRODUCT = QtPBFImagePlugin
     QMAKE_TARGET_DESCRIPTION = Qt $$QT_VERSION MVT/PBF image plugin
     QMAKE_TARGET_COPYRIGHT = Copyright (c) 2018-2025 Martin Tuma
 }
 macx {
-    INCLUDEPATH += $$PROTOBUF/include
-    LIBS += $$PROTOBUF/lib/libprotobuf-lite.a \
-        -lz
+    !equals(USE_PKGCONFIG, "true") {
+        INCLUDEPATH += $$PROTOBUF/include
+        LIBS += $$PROTOBUF/lib/libprotobuf-lite.a \
+            -lz
+    }
 }
 android {
-    INCLUDEPATH += $$PROTOBUF/include
-    LIBS += $$PROTOBUF/$$ANDROID_TARGET_ARCH/libprotobuf-lite.a \
-        -lz
+    !equals(USE_PKGCONFIG, "true") {
+        INCLUDEPATH += $$PROTOBUF/include
+        LIBS += $$PROTOBUF/$$ANDROID_TARGET_ARCH/libprotobuf-lite.a \
+            -lz
+    }
 
     top_builddir=$$shadowed($$PWD)
     DESTDIR = $$top_builddir/plugins