diff --git a/CMakeLists.txt b/CMakeLists.txt
index f10f489..28ce98a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,6 +119,12 @@ find_package(ZLIB REQUIRED)
 if(UNIX
    AND NOT (APPLE OR BEOS OR HAIKU)
    AND NOT EMSCRIPTEN)
+  block(SCOPE_FOR VARIABLES)
+    if(VCPKG_CRT_LINKAGE STREQUAL "static")
+      list(PREPEND CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_STATIC_LIBRARY_SUFFIX}")
+    endif()
+    find_library(M_LIBRARY m PATHS ${CMAKE_C_IMPLICIT_LINK_DIRECTORIES})
+  endblock()
   find_library(M_LIBRARY m)
   if(M_LIBRARY)
     set(M_LIBRARY m)
@@ -208,8 +214,8 @@ if(PNG_HARDWARE_OPTIMIZATIONS)
 
   # Set definitions and sources for MIPS.
   if(PNG_TARGET_ARCHITECTURE MATCHES "^(mipsel|mips64el)")
-    set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
-    set(PNG_MIPS_MSA "on"
+    set(PNG_MIPS_MSA_POSSIBLE_VALUES on off check)
+    set(PNG_MIPS_MSA "check"
         CACHE STRING "Enable MIPS_MSA optimizations: on|off; on is default")
     set_property(CACHE PNG_MIPS_MSA
                 PROPERTY STRINGS ${PNG_MIPS_MSA_POSSIBLE_VALUES})
@@ -241,6 +247,12 @@ if(PNG_HARDWARE_OPTIMIZATIONS)
           mips/filter_msa_intrinsics.c)
       add_definitions(-DPNG_MIPS_MSA_OPT=2)
       add_definitions(-DPNG_MIPS_MMI_OPT=0)
+    elseif(PNG_MIPS_MSA STREQUAL "check")
+      set(libpng_mips_sources
+          mips/mips_init.c
+          mips/filter_msa_intrinsics.c)
+      add_definitions(-DPNG_MIPS_MSA_CHECK_SUPPORTED)
+      add_definitions(-DPNG_MIPS_MMI_CHECK_SUPPORTED)
     elseif(PNG_MIPS_MMI STREQUAL "on")
       set(libpng_mips_sources
           mips/mips_init.c
@@ -594,7 +606,7 @@ else()
   # We also need to use a custom suffix, in order to distinguish between the
   # shared import library name and the static library name.
   set(PNG_SHARED_OUTPUT_NAME "libpng${PNGLIB_ABI_VERSION}")
-  set(PNG_STATIC_OUTPUT_NAME "libpng${PNGLIB_ABI_VERSION}_static")
+  set(PNG_STATIC_OUTPUT_NAME "libpng${PNGLIB_ABI_VERSION}")
 endif()
 
 if(PNG_SHARED)
@@ -858,9 +870,9 @@ if(PNG_TESTS AND PNG_SHARED)
                FILES ${PNGSUITE_PNGS})
 endif()
 
-if(PNG_SHARED AND PNG_TOOLS)
+if(PNG_TOOLS)
   add_executable(pngfix ${pngfix_sources})
-  target_link_libraries(pngfix PRIVATE png_shared)
+  target_link_libraries(pngfix PRIVATE $<TARGET_NAME_IF_EXISTS:png_shared> $<TARGET_NAME_IF_EXISTS:png_static>) # in vcpkg there's only one
   set(PNG_BIN_TARGETS pngfix)
 
   add_executable(png-fix-itxt ${png_fix_itxt_sources})
@@ -944,12 +956,15 @@ endif()
 # We use the same files like ./configure, so we have to set its vars.
 # Only do this on Windows for Cygwin - the files don't make much sense
 # outside of a UNIX look-alike.
-if(NOT WIN32 OR CYGWIN OR MINGW)
+if(1)
   set(prefix      ${CMAKE_INSTALL_PREFIX})
   set(exec_prefix ${CMAKE_INSTALL_PREFIX})
   set(libdir      ${CMAKE_INSTALL_FULL_LIBDIR})
   set(includedir  ${CMAKE_INSTALL_FULL_INCLUDEDIR})
-  set(LIBS        "-lz -lm")
+  set(LIBS        "")
+  if(M_LIBRARY)
+    string(APPEND LIBS "-lm")
+  endif()
   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
                  ${CMAKE_CURRENT_BINARY_DIR}/libpng${PNGLIB_ABI_VERSION}.pc
                  @ONLY)
@@ -1008,6 +1023,9 @@ if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL)
 endif()
 
 if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL)
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${PNGLIB_ABI_VERSION}.pc
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+elseif(0)
   # Install the man pages.
   install(FILES libpng.3 libpngpf.3
           DESTINATION ${CMAKE_INSTALL_MANDIR}/man3)