diff --git a/INSTALL.md b/INSTALL.md
index 2e980f9b6..ad31a711b 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -40,7 +40,7 @@ Once you have all the dependencies above installed, configure opam as
 follows:
 
 ```sh
-opam init -y --comp=4.01.0
+opam init -y
 eval $(opam config env)
 opam update
 opam install -y \
@@ -121,7 +121,7 @@ webpage](https://opam.ocaml.org/doc/Install.html).
 Once opam is installed, run the following commands:
 
 ```sh
-./opam init -y --comp=4.01.0
+./opam init -y
 eval $(./opam config env)
 ./opam update
 ./opam install -y \
@@ -142,7 +142,9 @@ these steps to get Infer up and running:
 git clone https://github.com/facebook/infer.git
 cd infer
 # Compile Infer
-make -C infer java
+./autogen.sh
+./configure
+make java
 # Install Infer into your PATH
 export PATH=`pwd`/infer/bin:$PATH
 ```
@@ -162,13 +164,14 @@ Infer.
 # Checkout Infer
 git clone https://github.com/facebook/infer.git
 cd infer
-git submodule update --init --recursive
+./autogen.sh
 # Compile clang
 facebook-clang-plugins/clang/setup.sh # go have a coffee :)
 # Compile the clang plugin
 ./compile-fcp.sh
 # Compile Infer
-make -C infer
+./configure
+make
 # Install Infer into your PATH
 export PATH=`pwd`/infer/bin:$PATH
 ```
diff --git a/m4/ac_assert_ocaml_pkg.m4 b/m4/ac_assert_ocaml_pkg.m4
index 84c0b080f..7aaaec152 100644
--- a/m4/ac_assert_ocaml_pkg.m4
+++ b/m4/ac_assert_ocaml_pkg.m4
@@ -17,21 +17,14 @@ AC_DEFUN([AC_ASSERT_OCAML_PKG],
   unset pkg
 
   has_pkg=$AS_TR_SH[OCAML_PKG_$1]
-  AS_IF([test "$has_pkg" = "no"],
-  [dnl
-   unset opam_command
-   unset version
-    opam_command="opam pin add $1 $3"
-    version=".$3"
-    AS_IF([test "x$3" = "x"],
-      [opam_command="opam install $1"
-      version=""])
+  AS_IF([test "$has_pkg" = "no"], [dnl
     AC_MSG_ERROR([missing dependency: $1$version.
 
 If you are using opam, please run
 
-  $opam_command])
+  \# create an "infer" opam package
+  opam pin add --no-action --yes -k path .
+  \# install dependencies
+  opam install --deps-only infer])
   ])
 ])
-
-
diff --git a/m4/ac_check_ocaml_pkg_path.m4 b/m4/ac_check_ocaml_pkg_path.m4
index 9a6ae5831..62f2cdf53 100644
--- a/m4/ac_check_ocaml_pkg_path.m4
+++ b/m4/ac_check_ocaml_pkg_path.m4
@@ -26,12 +26,37 @@ AC_DEFUN([AC_CHECK_OCAML_PKG_PATH],
   found=no
   if test "x$pkg" != "xno"; then
     path=`$OCAMLFIND query $pkg 2>/dev/null`
-    version=`$OCAMLFIND query -format '%v' $pkg 2>/dev/null`
-    if test "x$3" = "x" || test "x$version" = "x$3"; then
+    if test "x$3" != "x"; then
+      version=`$OCAMLFIND query -format '%v' $pkg 2>/dev/null`
+      unset major_req
+      unset minor_req
+      unset patch_req
+      unset major_inst
+      unset minor_inst
+      unset patch_inst
+
+      major_req=$(printf $3 | cut -d . -f 1)
+      minor_req=$(printf $3 | cut -d . -f 2)
+      patch_req=$(printf $3 | cut -d . -f 3)
+
+      major_inst=$(printf $version | cut -d . -f 1)
+      minor_inst=$(printf $version | cut -d . -f 2)
+      # discard trailing characters after patch number, eg 1.2.3+4~5 -> 3
+      patch_inst=$(printf $version | cut -d . -f 3 | grep -o -e '^[[:digit:]]*')
+      if test $major_inst -gt $major_req || \
+         (test $major_inst -eq $major_req && \
+          (test $minor_inst -gt $minor_req || \
+           (test $minor_inst -eq $minor_req && \
+            test $path_inst -ge $path_req))); then
+        found=yes
+      fi
+    else
+      found=yes
+    fi
+    if test "$found" = "yes" ; then
       AC_MSG_RESULT([$path])
       AS_TR_SH([OCAML_PKG_$1])=$pkg
       AS_TR_SH([OCAML_PKG_PATH_$1])=$path
-      found=yes
     fi
   fi
 
diff --git a/opam b/opam
index bfb071e0e..ba8f660af 100644
--- a/opam
+++ b/opam
@@ -16,10 +16,10 @@ install: []
 remove: []
 depends: [
   "ocamlfind" {build}
-  "sawja" {="1.5.1"}
-  "atdgen" {="1.6.0"}
-  "javalib" {="2.3.1"}
-  "extlib" {="1.5.4"}
+  "sawja" {>="1.5.1"}
+  "atdgen" {>="1.6.0"}
+  "javalib" {>="2.3.1"}
+  "extlib" {>="1.5.4"}
 ]
 depexts: [
   [ ["ubuntu"] ["python2.7-dev"] ]