diff --git a/mosflm/bravais_fortran.c b/mosflm/bravais_fortran.c
index 3d68cad..800bd0e 100644
--- a/mosflm/bravais_fortran.c
+++ b/mosflm/bravais_fortran.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <math.h>
 #include "../util/util.h"
+#include "../util/bravais.h"
 
 /* bravais_fortran_(): This routine converts array from FORTRAN program
                        to structure for call to bravais
diff --git a/mosflm/chelp.c b/mosflm/chelp.c
index b2aaefc..fa44ab0 100644
--- a/mosflm/chelp.c
+++ b/mosflm/chelp.c
@@ -5,6 +5,7 @@
 /* modified for Linux by Joachim Meyer jmeyer@embl-heidelberg.de 1998.05.19 */
 
 #include "chelp.h"
+#include <stdio.h>
 
 #if CALL_LIKE_HPUX
   void chelp ()
diff --git a/mosflm/pck.c b/mosflm/pck.c
index ec094fc..288671d 100644
--- a/mosflm/pck.c
+++ b/mosflm/pck.c
@@ -17,6 +17,7 @@
 #include <math.h>
 #include <ctype.h>
 #include <string.h>
+#include <unistd.h>
 
 #define BYTE char
 #define WORD short int