Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -144,7 +144,7 @@ if(MSVC)
 endif(MSVC)
 
 if(UNIX)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}  -lm")
+    #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}  -lm")
     add_definitions(-Wall -Wpedantic -Wno-switch -Wno-strict-aliasing)
 
     # Use ASAN for development versions
@@ -202,9 +202,6 @@ qt_standard_project_setup(
     I18N_TRANSLATED_LANGUAGES ca cs de es fr it nl ru
 )
 
-if(${PROJ_VERSION} VERSION_LESS 8.0.0)
-    message( SEND_ERROR "You need at least PROJ 8.0.0 or newer.")
-endif()
 
 if(USE_QT6DBus)
     find_package(Qt6DBus REQUIRED)
