diff --git a/1984/anonymous/Makefile b/1984/anonymous/Makefile
index b0b2cd733..385143ba1 100644
--- a/1984/anonymous/Makefile
+++ b/1984/anonymous/Makefile
@@ -143,6 +143,7 @@ GENCAT= gencat
 GENSTRINGS= genstrings
 GETOPT= getopt
 GETOPTS= getopts
+GINDENT= gindent
 GNUMAKE= gnumake
 GREP= grep
 GROFF= groff
diff --git a/1984/decot/Makefile b/1984/decot/Makefile
index 74f036206..9098ad42e 100644
--- a/1984/decot/Makefile
+++ b/1984/decot/Makefile
@@ -143,6 +143,7 @@ GENCAT= gencat
 GENSTRINGS= genstrings
 GETOPT= getopt
 GETOPTS= getopts
+GINDENT= gindent
 GNUMAKE= gnumake
 GREP= grep
 GROFF= groff
diff --git a/1984/laman/Makefile b/1984/laman/Makefile
index 9a04a3bbc..fb6f8c114 100644
--- a/1984/laman/Makefile
+++ b/1984/laman/Makefile
@@ -143,6 +143,7 @@ GENCAT= gencat
 GENSTRINGS= genstrings
 GETOPT= getopt
 GETOPTS= getopts
+GINDENT= gindent
 GNUMAKE= gnumake
 GREP= grep
 GROFF= groff
diff --git a/1984/mullender/Makefile b/1984/mullender/Makefile
index 19bc337cb..f623a8d24 100644
--- a/1984/mullender/Makefile
+++ b/1984/mullender/Makefile
@@ -143,6 +143,7 @@ GENCAT= gencat
 GENSTRINGS= genstrings
 GETOPT= getopt
 GETOPTS= getopts
+GINDENT= gindent
 GNUMAKE= gnumake
 GREP= grep
 GROFF= groff