diff --git a/extra/meson/build b/extra/meson/build
deleted file mode 100755
index 366c5443..00000000
--- a/extra/meson/build
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/sh -e
-
-python setup.py build
-python setup.py install \
-    --root="$1" \
-    --optimize=1 \
-    --skip-build
diff --git a/extra/meson/checksums b/extra/meson/checksums
deleted file mode 100644
index 5f0f67ad..00000000
--- a/extra/meson/checksums
+++ /dev/null
@@ -1 +0,0 @@
-e9f52047f26636ee512439c01755064656db5faecdd68e9af09dc772d829198c  0.50.1.tar.gz
diff --git a/extra/meson/depends b/extra/meson/depends
deleted file mode 100644
index 3df67362..00000000
--- a/extra/meson/depends
+++ /dev/null
@@ -1,3 +0,0 @@
-ninja
-python
-python-setuptools
diff --git a/extra/meson/licenses b/extra/meson/licenses
deleted file mode 100644
index fe2e41e0..00000000
--- a/extra/meson/licenses
+++ /dev/null
@@ -1,2 +0,0 @@
-Apache-2.0
-
diff --git a/extra/meson/sources b/extra/meson/sources
deleted file mode 100644
index b8db2c89..00000000
--- a/extra/meson/sources
+++ /dev/null
@@ -1 +0,0 @@
-https://github.com/mesonbuild/meson/archive/0.50.1.tar.gz
diff --git a/extra/meson/version b/extra/meson/version
deleted file mode 100644
index 51146537..00000000
--- a/extra/meson/version
+++ /dev/null
@@ -1 +0,0 @@
-0.50.1 1
diff --git a/extra/ninja/build b/extra/ninja/build
deleted file mode 100755
index 6a4e05b8..00000000
--- a/extra/ninja/build
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/sh -e
-
-patch -p1 < fix-musl.patch
-python configure.py --bootstrap
-install -m755 -D ninja "$1/usr/bin/ninja"
diff --git a/extra/ninja/checksums b/extra/ninja/checksums
deleted file mode 100644
index 93bd3bde..00000000
--- a/extra/ninja/checksums
+++ /dev/null
@@ -1,2 +0,0 @@
-5d7ec75828f8d3fd1a0c2f31b5b0cea780cdfe1031359228c428c1a48bfcd5b9  v1.9.0.tar.gz
-322b1bed1fba2e7a26f030f01d0c2ef570bf01424296b0116cc45d59ea40ea50  fix-musl.patch
diff --git a/extra/ninja/depends b/extra/ninja/depends
deleted file mode 100644
index ecc77727..00000000
--- a/extra/ninja/depends
+++ /dev/null
@@ -1 +0,0 @@
-python make
diff --git a/extra/ninja/licenses b/extra/ninja/licenses
deleted file mode 100644
index e69de29b..00000000
diff --git a/extra/ninja/manifest b/extra/ninja/manifest
deleted file mode 100644
index fed414c5..00000000
--- a/extra/ninja/manifest
+++ /dev/null
@@ -1,14 +0,0 @@
-/var/db/kiss/ninja/version
-/var/db/kiss/ninja/sources
-/var/db/kiss/ninja/manifest
-/var/db/kiss/ninja/licenses
-/var/db/kiss/ninja/depends
-/var/db/kiss/ninja/checksums
-/var/db/kiss/ninja/build
-/var/db/kiss/ninja/
-/var/db/kiss/
-/var/db/
-/var/
-/usr/bin/ninja
-/usr/bin/
-/usr/
diff --git a/extra/ninja/patches/fix-musl.patch b/extra/ninja/patches/fix-musl.patch
deleted file mode 100644
index 543d4f1c..00000000
--- a/extra/ninja/patches/fix-musl.patch
+++ /dev/null
@@ -1,39 +0,0 @@
-2ff54ad7478a90bd75c91e434236a Mon Sep 17 00:00:00 2001
-From: makepost <makepost@firemail.cc>
-Date: Mon, 24 Dec 2018 03:13:16 +0200
-Subject: [PATCH] Use st_mtim if st_mtime is macro, fix #1510
-
-In POSIX.1-2008, sys_stat has a st_mtim member and a st_mtime backward
-compatibility macro. Should help avoid hardcoding platform detection.
----
- src/disk_interface.cc | 14 ++++----------
- 1 file changed, 4 insertions(+), 10 deletions(-)
-
-diff --git a/src/disk_interface.cc b/src/disk_interface.cc
-index d4c2fb087..dc297c449 100644
---- src/disk_interface.cc
-+++ /src/disk_interface.cc
-@@ -202,19 +202,13 @@ TimeStamp RealDiskInterface::Stat(const string& path, string* err) const {
-   // that it doesn't exist.
-   if (st.st_mtime == 0)
-     return 1;
--#if defined(__APPLE__) && !defined(_POSIX_C_SOURCE)
-+#if defined(_AIX)
-+  return (int64_t)st.st_mtime * 1000000000LL + st.st_mtime_n;
-+#elif defined(__APPLE__)
-   return ((int64_t)st.st_mtimespec.tv_sec * 1000000000LL +
-           st.st_mtimespec.tv_nsec);
--#elif (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700 || defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || \
--       defined(__BIONIC__) || (defined (__SVR4) && defined (__sun)) || defined(__FreeBSD__))
--  // For glibc, see "Timestamp files" in the Notes of http://www.kernel.org/doc/man-pages/online/pages/man2/stat.2.html
--  // newlib, uClibc and musl follow the kernel (or Cygwin) headers and define the right macro values above.
--  // For bsd, see https://github.com/freebsd/freebsd/blob/master/sys/sys/stat.h and similar
--  // For bionic, C and POSIX API is always enabled.
--  // For solaris, see https://docs.oracle.com/cd/E88353_01/html/E37841/stat-2.html.
-+#elif defined(st_mtime) // A macro, so we're likely on modern POSIX.
-   return (int64_t)st.st_mtim.tv_sec * 1000000000LL + st.st_mtim.tv_nsec;
--#elif defined(_AIX)
--  return (int64_t)st.st_mtime * 1000000000LL + st.st_mtime_n;
- #else
-   return (int64_t)st.st_mtime * 1000000000LL + st.st_mtimensec;
- #endif
diff --git a/extra/ninja/sources b/extra/ninja/sources
deleted file mode 100644
index ab6da971..00000000
--- a/extra/ninja/sources
+++ /dev/null
@@ -1,2 +0,0 @@
-https://github.com/martine/ninja/archive/v1.9.0.tar.gz
-patches/fix-musl.patch
diff --git a/extra/ninja/version b/extra/ninja/version
deleted file mode 100644
index 67fe23c8..00000000
--- a/extra/ninja/version
+++ /dev/null
@@ -1 +0,0 @@
-1.9.0 1