diff -rupN --no-dereference qtbase-everywhere-src-5.15.2/mkspecs/features/create_cmake.prf qtbase-everywhere-src-5.15.2-new/mkspecs/features/create_cmake.prf
--- qtbase-everywhere-src-5.15.2/mkspecs/features/create_cmake.prf	2020-11-23 10:29:30.179570101 +0100
+++ qtbase-everywhere-src-5.15.2-new/mkspecs/features/create_cmake.prf	2020-11-23 10:29:32.034565415 +0100
@@ -332,8 +332,14 @@ mac {
         CMAKE_WINMAIN_FILE_LOCATION_DEBUG = libqt5main$${QT_LIBINFIX}$${debug_suffix}.a
         CMAKE_WINMAIN_FILE_LOCATION_RELEASE = libqt5main$${QT_LIBINFIX}.a
 
-        CMAKE_IMPLIB_FILE_LOCATION_DEBUG = lib$${CMAKE_QT_STEM}$${debug_suffix}.a
-        CMAKE_IMPLIB_FILE_LOCATION_RELEASE = lib$${CMAKE_QT_STEM}.a
+        isEmpty(QMAKE_EXTENSION_IMPORTLIB): QMAKE_EXTENSION_IMPORTLIB = a
+        !isEmpty(CMAKE_STATIC_TYPE) {
+            CMAKE_IMPLIB_FILE_LOCATION_DEBUG = lib$${CMAKE_QT_STEM}d.a
+            CMAKE_IMPLIB_FILE_LOCATION_RELEASE = lib$${CMAKE_QT_STEM}.a
+        } else {
+            CMAKE_IMPLIB_FILE_LOCATION_DEBUG = lib$${CMAKE_QT_STEM}d.$${QMAKE_EXTENSION_IMPORTLIB}
+            CMAKE_IMPLIB_FILE_LOCATION_RELEASE = lib$${CMAKE_QT_STEM}.$${QMAKE_EXTENSION_IMPORTLIB}
+        }
     } else {
         CMAKE_WINMAIN_FILE_LOCATION_DEBUG = qt5main$${QT_LIBINFIX}$${debug_suffix}.lib
         CMAKE_WINMAIN_FILE_LOCATION_RELEASE = qt5main$${QT_LIBINFIX}.lib
diff -rupN --no-dereference qtbase-everywhere-src-5.15.2/mkspecs/features/qt.prf qtbase-everywhere-src-5.15.2-new/mkspecs/features/qt.prf
--- qtbase-everywhere-src-5.15.2/mkspecs/features/qt.prf	2020-10-27 09:02:11.000000000 +0100
+++ qtbase-everywhere-src-5.15.2-new/mkspecs/features/qt.prf	2020-11-23 10:29:32.034565415 +0100
@@ -216,11 +216,15 @@ for(ever) {
                 LIBS$$var_sfx += -framework $$framework
             } else {
                 lib = $$MODULE_MODULE$$qtPlatformTargetSuffix()
-                win32|contains(MODULE_CONFIG, staticlib) {
+                contains(MODULE_CONFIG, staticlib) {
                     lib = $$MODULE_LIBS/$$QMAKE_PREFIX_STATICLIB$${lib}.$$QMAKE_EXTENSION_STATICLIB
                     PRE_TARGETDEPS += $$lib
                 } else {
-                    lib = $$MODULE_LIBS/$$QMAKE_PREFIX_SHLIB$${lib}.$$QMAKE_EXTENSION_SHLIB
+                    win32 {
+                        lib = $$MODULE_LIBS/$$QMAKE_PREFIX_STATICLIB$${lib}.$$QMAKE_EXTENSION_IMPORTLIB
+                    } else {
+                        lib = $$MODULE_LIBS/$$QMAKE_PREFIX_SHLIB$${lib}.$$QMAKE_EXTENSION_SHLIB
+                    }
                 }
                 LIBS$$var_sfx += $$lib
             }
diff -rupN --no-dereference qtbase-everywhere-src-5.15.2/qmake/generators/win32/winmakefile.cpp qtbase-everywhere-src-5.15.2-new/qmake/generators/win32/winmakefile.cpp
--- qtbase-everywhere-src-5.15.2/qmake/generators/win32/winmakefile.cpp	2020-10-27 09:02:11.000000000 +0100
+++ qtbase-everywhere-src-5.15.2-new/qmake/generators/win32/winmakefile.cpp	2020-11-23 10:29:32.034565415 +0100
@@ -99,9 +99,13 @@ private:
 bool
 Win32MakefileGenerator::findLibraries(bool linkPrl, bool mergeLflags)
 {
-    ProStringList impexts = project->values("QMAKE_LIB_EXTENSIONS");
-    if (impexts.isEmpty())
-        impexts = project->values("QMAKE_EXTENSION_STATICLIB");
+    ProStringList impexts;
+    if (project->isActiveConfig("staticlib")) {
+        impexts.append(project->values("QMAKE_EXTENSION_STATICLIB"));
+    } else {
+        impexts.append(project->values("QMAKE_EXTENSION_IMPORTLIB"));
+        impexts.append(project->values("QMAKE_EXTENSION_STATICLIB"));
+    }
     QVector<LibrarySearchPath> dirs;
     int libidx = 0;
     for (const ProString &dlib : project->values("QMAKE_DEFAULT_LIBDIRS"))
@@ -283,9 +287,12 @@ void Win32MakefileGenerator::fixTargetEx
     if (!project->values("QMAKE_APP_FLAG").isEmpty()) {
         project->values("TARGET_EXT").append(".exe");
     } else if (project->isActiveConfig("shared")) {
+        ProString impext = project->first("QMAKE_EXTENSION_IMPORTLIB");
+        if (impext.isEmpty())
+          impext = project->first("QMAKE_PREFIX_STATICLIB");
         project->values("LIB_TARGET").prepend(project->first("QMAKE_PREFIX_STATICLIB")
                                               + project->first("TARGET") + project->first("TARGET_VERSION_EXT")
-                                              + '.' + project->first("QMAKE_EXTENSION_STATICLIB"));
+                                              + '.' + impext);
         project->values("TARGET_EXT").append(project->first("TARGET_VERSION_EXT") + "."
                 + project->first("QMAKE_EXTENSION_SHLIB"));
         project->values("TARGET").first() = project->first("QMAKE_PREFIX_SHLIB") + project->first("TARGET");