--- vendor/CMakeLists.txt.orig	2026-08-01 05:20:11 UTC
+++ vendor/CMakeLists.txt
@@ -41,6 +41,15 @@ add_compile_definitions(_FILE_OFFSET_BITS=64 _LARGEFIL
 # 32-bit glibc platforms this is not the case by default.
 add_compile_definitions(_FILE_OFFSET_BITS=64 _LARGEFILE64_SOURCE)
 
+# On FreeBSD, _XOPEN_SOURCE (used by some sub-targets) hides BSD extensions
+# like getprogname(). Ensure BSD visibility is preserved.
+# Also provide compat macros for 64-bit functions that don't exist on FreeBSD
+# (off_t is always 64-bit on FreeBSD).
+if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+	add_compile_definitions(__BSD_VISIBLE=1)
+	add_compile_definitions(lseek64=lseek ftruncate64=ftruncate mmap64=mmap pread64=pread pwrite64=pwrite off64_t=off_t)
+endif()
+
 set(android-vendored
 	avb
 	adb