diff -Nru ecl-21.2.1+ds/debian/changelog ecl-21.2.1+ds/debian/changelog
--- ecl-21.2.1+ds/debian/changelog	2022-01-14 20:24:24.000000000 +0000
+++ ecl-21.2.1+ds/debian/changelog	2022-01-15 08:32:24.000000000 +0000
@@ -1,3 +1,9 @@
+ecl (21.2.1+ds-4) unstable; urgency=medium
+
+  * Add dependency on libecl-dev to ecl.
+
+ -- Tobias Hansen <thansen@debian.org>  Sat, 15 Jan 2022 08:32:24 +0000
+
 ecl (21.2.1+ds-3) unstable; urgency=medium
 
   * Install help.doc.
diff -Nru ecl-21.2.1+ds/debian/control ecl-21.2.1+ds/debian/control
--- ecl-21.2.1+ds/debian/control	2021-12-12 11:01:41.000000000 +0000
+++ ecl-21.2.1+ds/debian/control	2022-01-15 08:32:14.000000000 +0000
@@ -26,7 +26,8 @@
 
 Package: ecl
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libecl21.2 (= ${binary:Version}),
+Depends: ${shlibs:Depends}, ${misc:Depends},
+ libecl21.2 (= ${binary:Version}), libecl-dev (= ${binary:Version}),
  libffi-dev, libgmp-dev, libncurses5-dev, libgc-dev, libatomic-ops-dev, gcc
 Provides: lisp-compiler
 Suggests: slime, ecl-doc