Modifying CMakeList to link pledge conditionally

CMakeLists.txt

@@ -5,8 +5,9 @@ project (ansilove C)
 include(CheckFunctionExists)
 include(GNUInstallDirs)
 
-# Check if system has strtonum
+# Check if system has pledge and strtonum
 list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_OPENBSD_SOURCE)
+check_function_exists(pledge HAVE_PLEDGE)
 check_function_exists(strtonum HAVE_STRTONUM)
 
 # Additional include directories for compat functions
@@ -21,6 +22,10 @@ set(SRC src/main.c src/albinfonts.c src/ansilove.c src/explode.c src/filesize.c
 
 set(FORMATS src/ansi.c src/artworx.c src/binary.c src/icedraw.c src/pcboard.c src/tundra.c src/xbin.c)
 
+if(NOT HAVE_PLEDGE)
+  set (SRC ${SRC} compat/pledge.c)
+endif()
+
 if(NOT HAVE_STRTONUM)
   set (SRC ${SRC} compat/strtonum.c)
 endif()