diff --git a/build/pkgs/modular_decomposition/SPKG.rst b/build/pkgs/modular_decomposition/SPKG.rst
deleted file mode 100644
index 543b8ce1b6b..00000000000
--- a/build/pkgs/modular_decomposition/SPKG.rst
+++ /dev/null
@@ -1,23 +0,0 @@
-modular_decomposition: A modular decomposition algorithm
-========================================================
-
-Description
------------
-
-This is an implementation of a modular decomposition algorithm.
-
-http://www.liafa.jussieu.fr/~fm/ (in french)
-
-License
--------
-
-GPL
-
-
-Upstream Contact
-----------------
-
-Fabien de Montgolfier
-
-http://www.liafa.jussieu.fr/~fm/
-
diff --git a/build/pkgs/modular_decomposition/checksums.ini b/build/pkgs/modular_decomposition/checksums.ini
deleted file mode 100644
index f113e676bb1..00000000000
--- a/build/pkgs/modular_decomposition/checksums.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-tarball=modular_decomposition-VERSION.tar.bz2
-sha1=b0ce6d839d1cd2e93d806e70b13bc40bcdbaf9e9
-sha256=cf2a950c5d2b320770afb0cda195e5df46a24c4fd5056906ca9502260b33446b
diff --git a/build/pkgs/modular_decomposition/distros/repology.txt b/build/pkgs/modular_decomposition/distros/repology.txt
deleted file mode 100644
index 951f13281c9..00000000000
--- a/build/pkgs/modular_decomposition/distros/repology.txt
+++ /dev/null
@@ -1 +0,0 @@
-modular-decomposition
diff --git a/build/pkgs/modular_decomposition/math b/build/pkgs/modular_decomposition/math
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/build/pkgs/modular_decomposition/package-version.txt b/build/pkgs/modular_decomposition/package-version.txt
deleted file mode 100644
index b3089db1733..00000000000
--- a/build/pkgs/modular_decomposition/package-version.txt
+++ /dev/null
@@ -1 +0,0 @@
-20100607
diff --git a/build/pkgs/modular_decomposition/spkg-install.in b/build/pkgs/modular_decomposition/spkg-install.in
deleted file mode 100644
index 4ed957d9061..00000000000
--- a/build/pkgs/modular_decomposition/spkg-install.in
+++ /dev/null
@@ -1,9 +0,0 @@
-cd src
-
-gcc -o "$SAGE_LOCAL/lib/libmodulardecomposition.so" dm.c random.c -fPIC --shared &&
-mv dm_english.h "$SAGE_LOCAL/include/modular_decomposition.h"
-
-if [ $? -ne 0 ]; then
-    echo "An error occurred whilst building modular_decomposition"
-    exit 1
-fi
diff --git a/build/pkgs/modular_decomposition/type b/build/pkgs/modular_decomposition/type
deleted file mode 100644
index 9839eb20815..00000000000
--- a/build/pkgs/modular_decomposition/type
+++ /dev/null
@@ -1 +0,0 @@
-experimental