diff --git a/CMakeLists.txt b/CMakeLists.txt
index da6854034..36c72ab8a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,7 +68,6 @@ if(WITH_CLANG_FORMAT)
 endif()
 
 include(CompilerFlags)
-include(DetectBSD)
 include(CheckIncludeFiles)
 include(CheckLibraryExists)
 include(CheckSymbolExists)
@@ -779,18 +778,6 @@ endif()
 
 add_subdirectory(libfreerdp)
 
-if(BSD)
-	if(IS_DIRECTORY /usr/local/include)
-		include_directories(/usr/local/include)
-		link_directories(/usr/local/lib)
-	endif()
-	if(OPENBSD)
-		if(IS_DIRECTORY /usr/X11R6/include)
-			include_directories(/usr/X11R6/include)
-		endif()
-	endif()
-endif()
-
 if(WITH_CHANNELS)
 	add_subdirectory(channels)
 endif()
diff --git a/cmake/DetectBSD.cmake b/cmake/DetectBSD.cmake
deleted file mode 100644
index 5c5b3b0ee..000000000
--- a/cmake/DetectBSD.cmake
+++ /dev/null
@@ -1,18 +0,0 @@
-# BSD
-if(${CMAKE_SYSTEM_NAME} MATCHES "BSD")
-    set(BSD TRUE CACHE INTERNAL "BSD detection")
-	if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
-        set(FREEBSD TRUE CACHE INTERNAL "BSD detection")
-	endif()
-	if(${CMAKE_SYSTEM_NAME} MATCHES "kFreeBSD")
-        set(KFREEBSD TRUE CACHE INTERNAL "BSD detection")
-	endif()
-	if(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
-        set(OPENBSD TRUE CACHE INTERNAL "BSD detection")
-	endif()
-endif()
-
-if(${CMAKE_SYSTEM_NAME} MATCHES "DragonFly")
-    set(BSD TRUE CACHE INTERNAL "BSD detection")
-    set(FREEBSD TRUE CACHE INTERNAL "BSD detection")
-endif()
diff --git a/cmake/PlatformDefaults.cmake b/cmake/PlatformDefaults.cmake
index a621124b8..1182d3cfd 100644
--- a/cmake/PlatformDefaults.cmake
+++ b/cmake/PlatformDefaults.cmake
@@ -3,7 +3,7 @@
 #
 # Compilation will fail without a replacement defining the symbols, but that can be
 # done by supplying a TOOLCHAIN_FILE defining these.
-option(USE_PLATFORM_DEFAULT "Use this configuration file for platform defaults. Supply -DCMAKE_TOOLCHAIN_FILE=<yourfile> otherwise." ON)
+option(USE_PLATFORM_DEFAULT "Use this configuration file for platform defaults. Supply -DCMAKE_TOOLCHAIN_FILE=<yourfile>." ON)
 if (USE_PLATFORM_DEFAULT)
     # default defines or other required preferences per platform
     if((CMAKE_SYSTEM_NAME MATCHES "WindowsStore") AND (CMAKE_SYSTEM_VERSION MATCHES "10.0"))
@@ -19,6 +19,8 @@ if (USE_PLATFORM_DEFAULT)
     endif()
 
     if("${CMAKE_SYSTEM_NAME}" MATCHES "FreeBSD")
+        set(BSD TRUE CACHE INTERNAL "platform default")
+        set(FREEBSD TRUE CACHE INTERNAL "platform default")
         # we want POSIX 2008. FreeBSD 14 does only support 2001 fully, but the subset we require from 2008
         # is implemented, so ignore _POSIX_VERSION from unistd.h
         add_definitions("-D_POSIX_C_SOURCE=200809L")
@@ -51,6 +53,35 @@ if (USE_PLATFORM_DEFAULT)
         add_definitions("-D_DARWIN_C_SOURCE")
     endif()
 
+    if(${CMAKE_SYSTEM_NAME} MATCHES "kFreeBSD")
+        set(BSD TRUE CACHE INTERNAL "platform default")
+        set(KFREEBSD TRUE CACHE INTERNAL "platform default")
+        add_definitions(-DKFREEBSD)
+        add_definitions("-D_GNU_SOURCE")
+	endif()
+
+    if(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
+        set(BSD TRUE CACHE INTERNAL "platform default")
+        set(OPENBSD TRUE CACHE INTERNAL "platform default")
+	endif()
+
+    if(${CMAKE_SYSTEM_NAME} MATCHES "DragonFly")
+        set(BSD TRUE CACHE INTERNAL "platform default")
+        set(FREEBSD TRUE CACHE INTERNAL "platform default")
+
+        # we want POSIX 2008. FreeBSD 14 does only support 2001 fully, but the subset we require from 2008
+        # is implemented, so ignore _POSIX_VERSION from unistd.h
+        add_definitions("-D_POSIX_C_SOURCE=200809L")
+        # TODO: FreeBSD allows mixing POSIX and BSD API calls if we do not set
+        # _POSIX_C_SOURCE but lack a macro to reenable the BSD calls...
+        add_definitions("-D__BSD_VISIBLE")
+
+        # There are some symbols only visible for XOpen standard
+        add_definitions("-D_XOPEN_SOURCE=700")
+        add_definitions("-D_FILE_OFFSET_BITS=64")
+        set(WINPR_TIMEZONE_FILE "/var/db/zoneinfo")
+    endif()
+
     # define a fallback for systems that do not support a timezone file or we did not yet test.
     # since most of these are BSD try a sensible default
     if (NOT WINPR_TIMEZONE_FILE)
diff --git a/winpr/libwinpr/file/file.c b/winpr/libwinpr/file/file.c
index 831f8ae6d..648455dcb 100644
--- a/winpr/libwinpr/file/file.c
+++ b/winpr/libwinpr/file/file.c
@@ -23,11 +23,6 @@
 #include <winpr/debug.h>
 #include <winpr/assert.h>
 
-#if defined(__FreeBSD_kernel__) && defined(__GLIBC__)
-#define _GNU_SOURCE
-#define KFREEBSD
-#endif
-
 #include <winpr/wtypes.h>
 #include <winpr/crt.h>
 #include <winpr/file.h>