diff --git a/daemon/chroot.ml b/daemon/chroot.ml
index 62f387ee0..087b50316 100644
--- a/daemon/chroot.ml
+++ b/daemon/chroot.ml
@@ -51,7 +51,7 @@ let f t func arg =
     try
       let chan = out_channel_of_descr wfd in
       output_value chan ret;
-      Pervasives.flush chan;
+      Stdlib.flush chan;
       Exit._exit 0
     with
       exn ->
diff --git a/docs/guestfs-building.pod b/docs/guestfs-building.pod
index 5a7fa40f5..2c0845212 100644
--- a/docs/guestfs-building.pod
+++ b/docs/guestfs-building.pod
@@ -119,7 +119,7 @@ virt tools which are still written in Perl.
 
 I<Required>.  Part of Perl core.
 
-=item OCaml E<ge> 4.04
+=item OCaml E<ge> 4.07
 
 =item OCaml findlib
 
diff --git a/generator/pr.ml b/generator/pr.ml
index d7e6eba31..ed6e93725 100644
--- a/generator/pr.ml
+++ b/generator/pr.ml
@@ -25,7 +25,7 @@ open Std_utils
 open Utils
 
 (* Output channel, 'pr' prints to this. *)
-let chan = ref Pervasives.stdout
+let chan = ref Stdlib.stdout
 
 (* Number of lines generated. *)
 let lines = ref 0
@@ -53,7 +53,7 @@ let output_to ?(perm = 0o444) filename k =
   chan := open_out filename_new;
   k ();
   close_out !chan;
-  chan := Pervasives.stdout;
+  chan := Stdlib.stdout;
 
   (* Is the new file different from the current file? *)
   if Sys.file_exists filename && files_equal filename filename_new then
diff --git a/m4/guestfs-ocaml.m4 b/m4/guestfs-ocaml.m4
index 850207177..39a8346f3 100644
--- a/m4/guestfs-ocaml.m4
+++ b/m4/guestfs-ocaml.m4
@@ -38,10 +38,10 @@ AC_ARG_ENABLE([ocaml],
     [],
     [enable_ocaml=yes])
 
-dnl OCaml >= 4.04 is required.
-ocaml_ver_str=4.04
+dnl OCaml >= 4.07 is required.
+ocaml_ver_str=4.07
 ocaml_min_major=4
-ocaml_min_minor=4
+ocaml_min_minor=7
 AC_MSG_CHECKING([if OCaml version >= $ocaml_ver_str])
 ocaml_major="`echo $OCAMLVERSION | $AWK -F. '{print $1}'`"
 ocaml_minor="`echo $OCAMLVERSION | $AWK -F. '{print $2}' | sed 's/^0//'`"