diff -rauN pdfalto-git/CMakeLists.txt pdfalto-use-system-libs-patch/CMakeLists.txt
--- pdfalto-git/CMakeLists.txt	2022-01-17 13:25:13.065067929 +0100
+++ pdfalto-use-system-libs-patch/CMakeLists.txt	2022-01-17 14:28:58.881738284 +0100
@@ -34,11 +34,17 @@
 
 set ( XML_LIB_SUBDIR ${CMAKE_CURRENT_SOURCE_DIR}/libs/libxml)
 
-set(FREETYPE_INCLUDE_DIR_ft2build ${CMAKE_CURRENT_SOURCE_DIR}/libs/freetype/include)
-set(FREETYPE_INCLUDE_DIR_freetype_freetype ${CMAKE_CURRENT_SOURCE_DIR}/libs/freetype/include)
+# yes, we should use pkg-config for that, I know..
+add_definitions(-I/usr/include/freetype)
+set(FREETYPE_INCLUDE_DIR_ft2build "")
+set(FREETYPE_INCLUDE_DIR_freetype_freetype "")
 
+# dito
+add_definitions(-I/usr/include/libxml2)
+
+add_definitions(-I/usr/include/libpng14)
 include_directories("${ZLIB_SUBDIR}/src")
-set(PNG_INCLUDE_DIRS ${PNG_SUBDIR}/src)
+#set(PNG_INCLUDE_DIRS "")
 set(PNG_FOUND TRUE)
 
 set ( ICU_PATH ${CMAKE_CURRENT_SOURCE_DIR}/libs/icu)
@@ -65,12 +71,12 @@
     set(ARCHSUFFIX "32")
 endif()
 
-set ( XML_LIBRARY ${XML_LIB_SUBDIR}/${OSSUFFIX}/${ARCHSUFFIX}/libxml2.a)
-set ( PNG_LIBRARIES ${PNG_SUBDIR}/${OSSUFFIX}/${ARCHSUFFIX}/libpng.a)
-set ( ZLIB_LIBRARY ${ZLIB_SUBDIR}/${OSSUFFIX}/${ARCHSUFFIX}/libzlib.a)
-set ( FREETYPE_LIBRARY ${CMAKE_CURRENT_SOURCE_DIR}/libs/freetype/${OSSUFFIX}/${ARCHSUFFIX}/libfreetype.a)
-set ( ICUUC_LIB ${CMAKE_CURRENT_SOURCE_DIR}/libs/icu/${OSSUFFIX}/${ARCHSUFFIX}/libicuuc.a)
-set ( ICUDATA_LIB ${CMAKE_CURRENT_SOURCE_DIR}/libs/icu/${OSSUFFIX}/${ARCHSUFFIX}/libicudata.a)
+set ( XML_LIBRARY -lxml2)
+set ( PNG_LIBRARIES -lpng14)
+set ( ZLIB_LIBRARY -lz)
+set ( FREETYPE_LIBRARY -lfreetype)
+set ( ICUUC_LIB -licuuc)
+set ( ICUDATA_LIB -licudata)
 
 
 set(XPDF_BUILD_DIR ${XPDF_SUBDIR}/build)
@@ -114,7 +120,6 @@
 target_include_directories(pdfalto
         PUBLIC ${XML_LIB_SUBDIR}/include
         PUBLIC ${FREETYPE_INCLUDE_DIR_ft2build}
-        PUBLIC ${PNG_INCLUDE_DIRS}
         PUBLIC ${ZLIB_SUBDIR}/src
         PUBLIC ${XPDF_SUBDIR}
         PUBLIC ${XPDF_SUBDIR}/goo
diff -rauN pdfalto-git/xpdf-4.03/CMakeLists.txt pdfalto-use-system-libs-patch/xpdf-4.03/CMakeLists.txt
--- pdfalto-git/xpdf-4.03/CMakeLists.txt	2022-01-17 13:25:13.318401264 +0100
+++ pdfalto-use-system-libs-patch/xpdf-4.03/CMakeLists.txt	2022-01-17 13:51:30.238402710 +0100
@@ -26,9 +26,9 @@
 add_subdirectory(xpdf)
 #add_subdirectory(xpdf-qt)
 
-if (NOT HAVE_FREETYPE_H)
-  message(WARNING "Couldn't find FreeType -- will not build pdftoppm, pdftopng, pdftohtml, or xpdf.")
-endif ()
+#if (NOT HAVE_FREETYPE_H)
+#  message(WARNING "Couldn't find FreeType -- will not build pdftoppm, pdftopng, pdftohtml, or xpdf.")
+#endif ()
 
 #if (NOT PNG_FOUND)
 #  message(WARNING "Couldn't find libpng -- will not build pdftopng or pdftohtml.")
diff -rauN pdfalto-git/xpdf-4.03/cmake-config.txt pdfalto-use-system-libs-patch/xpdf-4.03/cmake-config.txt
--- pdfalto-git/xpdf-4.03/cmake-config.txt	2022-01-17 13:25:13.318401264 +0100
+++ pdfalto-use-system-libs-patch/xpdf-4.03/cmake-config.txt	2022-01-17 14:41:58.885072346 +0100
@@ -196,9 +196,9 @@
 else ()
   message(STATUS "FreeType not found")
 endif ()
-if (HAVE_FREETYPE_H)
+#if (HAVE_FREETYPE_H)
   set(HAVE_SPLASH TRUE)
-endif ()
+#endif ()
 
 
 #--- look for zlib
diff -rauN pdfalto-git/xpdf-4.03/splash/CMakeLists.txt pdfalto-use-system-libs-patch/xpdf-4.03/splash/CMakeLists.txt
--- pdfalto-git/xpdf-4.03/splash/CMakeLists.txt	2022-01-17 13:25:13.321734596 +0100
+++ pdfalto-use-system-libs-patch/xpdf-4.03/splash/CMakeLists.txt	2022-01-17 14:52:42.358406339 +0100
@@ -13,7 +13,8 @@
   include_directories("${PROJECT_BINARY_DIR}")
   include_directories("${PROJECT_SOURCE_DIR}/goo")
   include_directories("${PROJECT_SOURCE_DIR}/fofi")
-  include_directories("${FREETYPE_INCLUDE_DIRS}")
+#  include_directories("${FREETYPE_INCLUDE_DIRS}")
+  include_directories("/usr/include/freetype2")
 
   if (HAVE_DTYPE4_H)
     include_directories("${DTYPE_INCLUDE_DIR}")
diff -rauN pdfalto-git/xpdf-4.03/xpdf/CMakeLists.txt pdfalto-use-system-libs-patch/xpdf-4.03/xpdf/CMakeLists.txt
--- pdfalto-git/xpdf-4.03/xpdf/CMakeLists.txt	2022-01-17 13:25:13.328401263 +0100
+++ pdfalto-use-system-libs-patch/xpdf-4.03/xpdf/CMakeLists.txt	2022-01-17 14:14:03.088404058 +0100
@@ -14,7 +14,8 @@
 include_directories("${PROJECT_SOURCE_DIR}/fofi")
 include_directories("${PROJECT_SOURCE_DIR}/splash")
 if (PNG_FOUND)
-  include_directories("${PNG_INCLUDE_DIRS}")
+  add_definitions(-I/usr/include/libpng14)
+# include_directories("${PNG_INCLUDE_DIRS}")
   add_definitions("${PNG_DEFINITIONS}")
 endif ()
 if (HAVE_LCMS)