diff --git a/CMakeLists.txt b/CMakeLists.txt
index c65b3e422..c0637bf1a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,10 +24,6 @@ include(cmake/Rust.cmake)
 # Work around issue where archive-built libs go in the wrong place.
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
 
-# Set up the machinery around FISH-BUILD-VERSION-FILE
-# This defines the FBVF variable.
-include(Version)
-
 # Set up the docs.
 include(cmake/Docs.cmake)
 
diff --git a/cmake/Version.cmake b/cmake/Version.cmake
deleted file mode 100644
index d18f17c7b..000000000
--- a/cmake/Version.cmake
+++ /dev/null
@@ -1,55 +0,0 @@
-# This file adds commands to manage the FISH-BUILD-VERSION-FILE (hereafter
-# FBVF). This file exists in the build directory and is used to populate the
-# documentation and also the version string in fish_version.o (printed with
-# `echo $version` and also fish --version). The essential idea is that we are
-# going to invoke git_version_gen.sh, which will update the
-# FISH-BUILD-VERSION-FILE only if it needs to change; this is what makes
-# incremental rebuilds fast.
-#
-# This code is delicate, with the chief subtlety revolving around Ninja. A
-# natural and naive approach would tell the generated build system that FBVF is
-# a dependency of fish_version.o, and that git_version_gen.sh updates it. Make
-# will then invoke the script, check the timestamp on fish_version.o and FBVF,
-# see that FBVF is earlier, and then not rebuild fish_version.o. Ninja,
-# however, decides what to build up-front and will unconditionally rebuild
-# fish_version.o.
-#
-# To avoid this with Ninja, we want to hook into its 'restat' option which we
-# can do through the BYPRODUCTS feature of CMake. See
-# https://cmake.org/cmake/help/latest/policy/CMP0058.html
-#
-# Unfortunately BYPRODUCTS behaves strangely with the Makefile generator: it
-# marks FBVF as generated and then CMake itself will `touch` it on every build,
-# meaning that using BYPRODUCTS will cause fish_version.o to be rebuilt
-# unconditionally with the Makefile generator. Thus we want to use the
-# natural-and-naive approach for Makefiles.
-
-# **IMPORTANT** If you touch these build rules, please test both Ninja and
-# Makefile generators with both a clean and dirty git tree. Verify that both
-# generated build systems rebuild fish when the git tree goes from dirty to
-# clean (and vice versa), and verify they do NOT rebuild it when the git tree
-# stays the same (incremental builds must be fast).
-
-# Just a handy abbreviation.
-set(FBVF FISH-BUILD-VERSION-FILE)
-
-# TODO: find a cleaner way to do this.
-IF (${CMAKE_GENERATOR} STREQUAL Ninja)
-  set(FBVF-OUTPUT fish-build-version-witness.txt)
-  set(CFBVF-BYPRODUCTS ${FBVF})
-else(${CMAKE_GENERATOR} STREQUAL Ninja)
-  set(FBVF-OUTPUT ${FBVF})
-  set(CFBVF-BYPRODUCTS)
-endif(${CMAKE_GENERATOR} STREQUAL Ninja)
-
-# Set up the version targets
-add_custom_target(CHECK-FISH-BUILD-VERSION-FILE
-                  COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build_tools/git_version_gen.sh ${CMAKE_CURRENT_BINARY_DIR}
-                  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-                  BYPRODUCTS ${CFBVF-BYPRODUCTS})
-
-add_custom_command(OUTPUT ${FBVF-OUTPUT}
-                    DEPENDS CHECK-FISH-BUILD-VERSION-FILE)
-
-# Abbreviation for the target.
-set(CFBVF CHECK-FISH-BUILD-VERSION-FILE)