diff --git a/source/cpan-modules/BUILD-DEPENDS b/source/cpan-modules/BUILD-DEPENDS
new file mode 100644
index 0000000..1cd5d8f
--- /dev/null
+++ b/source/cpan-modules/BUILD-DEPENDS
@@ -0,0 +1 @@
+# Custom packages required to build this package.
diff --git a/source/cpan-modules/REVERSE-BUILD-DEPENDS b/source/cpan-modules/REVERSE-BUILD-DEPENDS
new file mode 100644
index 0000000..aef0a2d
--- /dev/null
+++ b/source/cpan-modules/REVERSE-BUILD-DEPENDS
@@ -0,0 +1,3 @@
+# Custom packages which require this package to build.
+spamassassin
+mj2
diff --git a/source/cpan-modules/REVERSE-DEPENDS b/source/cpan-modules/REVERSE-DEPENDS
deleted file mode 100644
index 50f9ef2..0000000
--- a/source/cpan-modules/REVERSE-DEPENDS
+++ /dev/null
@@ -1,2 +0,0 @@
-spamassassin (custom)
-mj2 (custom)
diff --git a/source/cpan-modules/cpan-modules.buildconf b/source/cpan-modules/cpan-modules.buildconf
index 87a3aa9..99a2262 100644
--- a/source/cpan-modules/cpan-modules.buildconf
+++ b/source/cpan-modules/cpan-modules.buildconf
@@ -12,7 +12,7 @@ SRC_FILENAMES=()
 SRC_DIRNAMES=()
 
 # Build configuration.
-BUILD_REQUIRES=("perl" "openssl" "db48")
+BUILD_REQUIRES=("perl" "openssl" "db48" "readline")
 BUILD_CONFLICTS=("$PKG_NAME")
 
 # The perl modules to build.