--- stage0/src/CMakeLists.txt.orig	2025-11-18 02:29:21 UTC
+++ stage0/src/CMakeLists.txt
@@ -473,6 +473,17 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
   string(APPEND TOOLCHAIN_SHARED_LINKER_FLAGS " -Wl,-rpath=\\$$ORIGIN/..:\\$$ORIGIN")
   string(APPEND LAKESHARED_LINKER_FLAGS " -Wl,--whole-archive ${CMAKE_BINARY_DIR}/lib/lean/libLake.a.export -Wl,--no-whole-archive")
   string(APPEND CMAKE_EXE_LINKER_FLAGS " -Wl,-rpath=$ORIGIN/../lib:$ORIGIN/../lib/lean")
+elseif(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
+  if(BSYMBOLIC)
+    string(APPEND LEANC_SHARED_LINKER_FLAGS " -Wl,-Bsymbolic")
+    string(APPEND TOOLCHAIN_SHARED_LINKER_FLAGS " -Wl,-Bsymbolic")
+  endif()
+  string(APPEND CMAKE_CXX_FLAGS " -fPIC -ftls-model=initial-exec")
+  string(APPEND LEANC_EXTRA_FLAGS " -fPIC")
+  string(APPEND TOOLCHAIN_SHARED_LINKER_FLAGS " -Wl,-rpath=\\$$ORIGIN/..:\\$$ORIGIN")
+  string(APPEND LAKESHARED_LINKER_FLAGS " -Wl,--whole-archive ${CMAKE_BINARY_DIR}/lib/lean/libLake.a.export -Wl,--no-whole-archive")
+  string(APPEND CMAKE_EXE_LINKER_FLAGS " -Wl,-rpath=$ORIGIN/../lib:$ORIGIN/../lib/lean")
+  set(LEAN_EXTRA_LAKEFILE_TOML "weakLeancArgs = [\"-fPIC\"]")
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   string(APPEND CMAKE_CXX_FLAGS " -ftls-model=initial-exec")
   string(APPEND INIT_SHARED_LINKER_FLAGS " -install_name @rpath/libInit_shared.dylib")
@@ -586,6 +597,9 @@ string(APPEND LEANC_OPTS " -I${CMAKE_BINARY_DIR}/inclu
 # Lean code only needs this one include
 string(APPEND LEANC_OPTS " -I${CMAKE_BINARY_DIR}/include")
 
+# Include extra flags (e.g., -fPIC on FreeBSD)
+string(APPEND LEANC_OPTS " ${LEANC_EXTRA_FLAGS}")
+
 # Use CMake profile C++ flags for building Lean libraries, but do not embed in `leanc`
 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
 string(APPEND LEANC_OPTS " ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE}}")
@@ -814,7 +828,7 @@ endif()
   file(CREATE_LINK ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR}/src/lean RESULT _IGNORE_RES SYMBOLIC)
 endif()
 
-install(DIRECTORY "${CMAKE_SOURCE_DIR}/" DESTINATION src/lean
+install(DIRECTORY "${CMAKE_SOURCE_DIR}/" DESTINATION share/lean4/src/lean
         FILES_MATCHING
         PATTERN "*.lean"
         PATTERN "*.md"
