diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23222d73c7..1c3d16f7b8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,12 +84,6 @@ set(ZIG_NO_LIB off CACHE BOOL
 set(ZIG_NO_LANGREF off CACHE BOOL
     "Disable copying of langref to the install prefix during the build phase")
 
-set(ZIG_SKIP_INSTALL_LIB_FILES off CACHE BOOL "Deprecated. Use ZIG_NO_LIB")
-if(ZIG_SKIP_INSTALL_LIB_FILES)
-  message(WARNING "ZIG_SKIP_INSTALL_LIB_FILES is deprecated. Use ZIG_NO_LIB instead.")
-  set(ZIG_NO_LIB ON)
-endif()
-
 set(ZIG_STATIC off CACHE BOOL "Attempt to build a static zig executable (not compatible with glibc)")
 set(ZIG_SHARED_LLVM off CACHE BOOL "Prefer linking against shared LLVM libraries")
 set(ZIG_STATIC_LLVM ${ZIG_STATIC} CACHE BOOL "Prefer linking against static LLVM libraries")
@@ -110,10 +104,6 @@ if (ZIG_SHARED_LLVM AND ZIG_STATIC_LLVM)
     message(SEND_ERROR "-DZIG_SHARED_LLVM and -DZIG_STATIC_LLVM cannot both be enabled simultaneously")
 endif()
 
-string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_LIB_DIR_ESCAPED "${ZIG_LIBC_LIB_DIR}")
-string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_STATIC_LIB_DIR_ESCAPED "${ZIG_LIBC_STATIC_LIB_DIR}")
-string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_INCLUDE_DIR_ESCAPED "${ZIG_LIBC_INCLUDE_DIR}")
-
 set(ZIG_TARGET_TRIPLE "native" CACHE STRING "arch-os-abi to output binaries for")
 set(ZIG_TARGET_MCPU "native" CACHE STRING "-mcpu parameter to output binaries for")
 set(ZIG_SINGLE_THREADED off CACHE BOOL "limit the zig compiler to use only 1 thread")
@@ -185,11 +175,6 @@ include_directories(${CLANG_INCLUDE_DIRS})
 find_package(Threads)
 
 set(ZIG_LIB_DIR "lib/zig")
-set(C_HEADERS_DEST "${ZIG_LIB_DIR}/include")
-set(LIBC_FILES_DEST "${ZIG_LIB_DIR}/libc")
-set(LIBUNWIND_FILES_DEST "${ZIG_LIB_DIR}/libunwind")
-set(LIBCXX_FILES_DEST "${ZIG_LIB_DIR}/libcxx")
-set(ZIG_STD_DEST "${ZIG_LIB_DIR}/std")
 set(ZIG_CONFIG_H_OUT "${CMAKE_BINARY_DIR}/config.h")
 set(ZIG_CONFIG_ZIG_OUT "${CMAKE_BINARY_DIR}/config.zig")
 
diff --git a/build.zig b/build.zig
index 208d06fe1d..a98845d6cc 100644
--- a/build.zig
+++ b/build.zig
@@ -28,11 +28,7 @@ pub fn build(b: *std.Build) !void {
     const use_zig_libcxx = b.option(bool, "use-zig-libcxx", "If libc++ is needed, use zig's bundled version, don't try to integrate with the system") orelse false;
 
     const test_step = b.step("test", "Run all the tests");
-    const deprecated_skip_install_lib_files = b.option(bool, "skip-install-lib-files", "deprecated. see no-lib") orelse false;
-    if (deprecated_skip_install_lib_files) {
-        std.log.warn("-Dskip-install-lib-files is deprecated in favor of -Dno-lib", .{});
-    }
-    const skip_install_lib_files = b.option(bool, "no-lib", "skip copying of lib/ files and langref to installation prefix. Useful for development") orelse deprecated_skip_install_lib_files;
+    const skip_install_lib_files = b.option(bool, "no-lib", "skip copying of lib/ files and langref to installation prefix. Useful for development") orelse false;
     const skip_install_langref = b.option(bool, "no-langref", "skip copying of langref to the installation prefix") orelse skip_install_lib_files;
 
     const docgen_exe = b.addExecutable(.{
@@ -58,12 +54,6 @@ pub fn build(b: *std.Build) !void {
     const docs_step = b.step("docs", "Build documentation");
     docs_step.dependOn(&docgen_cmd.step);
 
-    // This is for legacy reasons, to be removed after our CI scripts are upgraded to use
-    // the file from the install prefix instead.
-    const legacy_write_to_cache = b.addWriteFiles();
-    legacy_write_to_cache.addCopyFileToSource(langref_file, "zig-cache/langref.html");
-    docs_step.dependOn(&legacy_write_to_cache.step);
-
     const check_case_exe = b.addExecutable(.{
         .name = "check-case",
         .root_source_file = .{ .path = "test/src/Cases.zig" },