--- a/src/libs/libgroff/assert.cpp
+++ b/src/libs/libgroff/assert.cpp
@@ -16,6 +16,10 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include "assert.h"
--- a/src/libs/libgroff/errarg.cpp
+++ b/src/libs/libgroff/errarg.cpp
@@ -17,6 +17,10 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include "assert.h"
 #include "errarg.h"
--- a/src/libs/libgroff/error.cpp
+++ b/src/libs/libgroff/error.cpp
@@ -17,6 +17,10 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
--- a/src/preproc/eqn/eqn.ypp
+++ b/src/preproc/eqn/eqn.ypp
@@ -16,6 +16,10 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 %{
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
--- a/src/libs/libgroff/curtime.cpp
+++ b/src/libs/libgroff/curtime.cpp
@@ -15,6 +15,10 @@
 The GNU General Public License version 2 (GPL2) is available in the
 internet at <http://www.gnu.org/licenses/gpl-2.0.txt>. */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
--- a/src/libs/libgroff/device.cpp
+++ b/src/libs/libgroff/device.cpp
@@ -17,6 +17,7 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#include "config.h"
 #include <stdlib.h>
 #include "device.h"
 #include "defs.h"
--- a/src/libs/libgroff/fatal.cpp
+++ b/src/libs/libgroff/fatal.cpp
@@ -16,6 +16,7 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#include "config.h"
 #include <stdlib.h>

 #define FATAL_ERROR_EXIT_CODE 3
--- a/src/libs/libgroff/string.cpp
+++ b/src/libs/libgroff/string.cpp
@@ -17,6 +17,10 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdlib.h>

 #include "lib.h"
--- a/src/libs/libgroff/strsave.cpp
+++ b/src/libs/libgroff/strsave.cpp
@@ -17,6 +17,7 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#include "config.h"
 #include <string.h>
 #include <stdlib.h>

--- a/src/preproc/eqn/text.cpp
+++ b/src/preproc/eqn/text.cpp
@@ -17,6 +17,7 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#include "config.h"
 #include <ctype.h>
 #include <stdlib.h>
 #include "eqn.h"
--- a/src/preproc/eqn/other.cpp
+++ b/src/preproc/eqn/other.cpp
@@ -17,6 +17,7 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#include "config.h"
 #include <stdlib.h>

 #include "eqn.h"
--- a/src/preproc/pic/object.cpp
+++ b/src/preproc/pic/object.cpp
@@ -17,6 +17,8 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>. */

+#include "config.h"
+
 #include <stdlib.h>

 #include "pic.h"