Fix gentoo-specific build and fix some CMake warnings
Some of that merged to upstream, see
https://github.com/lancos/ponyprog/pull/44
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e46672..7d8eb67 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,16 +1,16 @@
-PROJECT(ponyprog)
-
 # Configure CMake ...
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.5 FATAL_ERROR)
 # CMAKE_POLICY(SET CMP0003 OLD)
 # CMAKE_POLICY(SET CMP0015 OLD)
 
+PROJECT(ponyprog)
+
 IF(WIN32)
     CMAKE_POLICY(SET CMP0020 NEW)
 ENDIF()
 
 # set the Qt version to 6 or 5
-OPTION (USE_QT5 "Using of Qt5 version for compiling" ON)
+OPTION (USE_QT5 "Using of Qt5 version for compiling" OFF)
 
 IF(${USE_QT5})
     SET(USE_QT_VERSION 5)
@@ -45,15 +45,7 @@ OPTION (USE_DEBUGGER "Include in binary file debug information" OFF)
 
 OPTION (USE_PROFILER "Include in binary file profiling information" OFF)
 
-
-IF(${USE_DEBUGGER})
-  SET(CMAKE_BUILD_TYPE Debug)
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG} -Wall")
-ELSE()
-  SET(CMAKE_BUILD_TYPE Release)
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} -Wall")
-ENDIF()
-
+ADD_COMPILE_OPTIONS("-Wall")
 MESSAGE(STATUS "CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS}")
 
 INCLUDE(CheckIncludeFile)
@@ -269,11 +261,12 @@ SET ( MOC_DIR temp )
 SET ( UI_HEADERS_DIR temp )
 SET ( UI_SOURCES_DIR temp )
 
-ADD_SUBDIRECTORY(qhexedit2/src)
 ADD_SUBDIRECTORY(SrcPony)
 
-INCLUDE_DIRECTORIES( ${CMAKE_CURRENT_SOURCE_DIR}/qhexedit2/src/ ${CMAKE_CURRENT_SOURCE_DIR}/SrcPony/ )
+find_library(QHexEdit_LIBRARY NAMES qhexedit)
+set(QHexEdit_LIBRARIES "${QHexEdit_LIBRARY}")
 
+INCLUDE_DIRECTORIES( ${CMAKE_CURRENT_SOURCE_DIR}/SrcPony/ )
 
 IF(${USE_QT_VERSION} MATCHES "5")
 #     QT5_ADD_TRANSLATION(APP_TRANSLATIONS ${TRANSLATION})
@@ -346,7 +339,7 @@ IF(${USE_QT_VERSION} MATCHES "6")
   #MESSAGE(STATUS "QT LIBRARIES: ${QT_LIBRARIES} ${Qt6Widgets_LIBRARIES} ${Qt6Multimedia_LIBRARIES} ${Qt6Xml_LIBRARIES} ${Qt6PrintSupport_LIBRARIES} ${Qt6Core_LIBRARIES}")
 ENDIF()
 
-TARGET_LINK_LIBRARIES(${CMAKE_PROJECT_NAME} ${LIBFTDI_LIBRARY} ${LIBUSB_LIBRARIES})
+TARGET_LINK_LIBRARIES(${CMAKE_PROJECT_NAME} ${LIBFTDI_LIBRARY} ${LIBUSB_LIBRARIES} ${QHexEdit_LIBRARIES})
 
 ADD_CUSTOM_TARGET (tags
     COMMAND  ctags -R -f tags ${CMAKE_SOURCE_DIR}/SrcPony