diff --git a/development/numpy/README b/development/numpy/README
index fe0e06e44f..7e44029a85 100644
--- a/development/numpy/README
+++ b/development/numpy/README
@@ -5,8 +5,22 @@ arrays.  NumPy is built on the Numeric code base and adds features
 introduced by numarray as well as an extended C-API and the ability to
 create arrays of arbitrary type which also makes NumPy suitable for
 interfacing with general-purpose data-base applications.
-        
+
 There are also basic facilities for discrete fourier transform, basic
 linear algebra and random number generation.
 
-If you need to build numpy for debugging, set DEBUG=y.
+If you need to build numpy for debugging, set DEBUG=y. If software
+depending on numpy is having problems with the new relaxed strides
+checking, set NPY_RSC=0.
+
+It is highly recommended to install optimized BLAS and LAPACK libs
+before installing numpy. You may choose between ATLAS+LAPACK and
+OpenBLAS.
+
+IMPORTANT: The version installed by this SlackBuild doesn NOT include the
+           oldnumeric and numarray compatibility modules since starting with
+           version 1.9.0 these modules got removed by the numpy developers.
+           If you need these compatibility modules please consider the
+           numpy-legacy SlackBuild.
+           THUS: This SlackBuild conflicts with the numpy-legacy SlackBuild
+                 which installs versions < 1.9.0!
diff --git a/development/numpy/numpy.SlackBuild b/development/numpy/numpy.SlackBuild
index 2bc381c679..d3e416836b 100644
--- a/development/numpy/numpy.SlackBuild
+++ b/development/numpy/numpy.SlackBuild
@@ -3,13 +3,13 @@
 # Slackware build script for NumPy
 
 # Written by Aleksandar Samardzic <asamardzic@gmail.com>
-# Updated up to 1.6.2 by Serban Udrea <S.Udrea@gsi.de>
+# Updated up to 1.9.0 by Serban Udrea <S.Udrea@gsi.de>
 # Added support for building with debugging symbols (S. Udrea)
 # LIBDIRSUFFIX is now needed to set the proper path for
 # UMFPACK (S. Udrea)
 
 PRGNAM=numpy
-VERSION=${VERSION:-1.8.0}
+VERSION=${VERSION:-1.9.0}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 
@@ -77,12 +77,12 @@ case "$DEBUG" in
 esac
 
 if [ ! "$DEBUG" ]; then
-  python setup.py install --root $PKG
+  NPY_RELAXED_STRIDES_CHECKING=${NPY_RSC:-1} python setup.py install --root $PKG
 
   find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
 else
-  python setup.py build --debug
+  NPY_RELAXED_STRIDES_CHECKING=${NPY_RSC:-1} python setup.py build --debug
   python setup.py install --root $PKG
 fi
 
diff --git a/development/numpy/numpy.info b/development/numpy/numpy.info
index b07704439c..2d911b98ef 100644
--- a/development/numpy/numpy.info
+++ b/development/numpy/numpy.info
@@ -1,8 +1,8 @@
 PRGNAM="numpy"
-VERSION="1.8.0"
+VERSION="1.9.0"
 HOMEPAGE="http://numpy.scipy.org/"
-DOWNLOAD="http://download.sourceforge.net/project/numpy/NumPy/1.8.0/numpy-1.8.0.tar.gz"
-MD5SUM="2a4b0423a758706d592abb6721ec8dcd"
+DOWNLOAD="http://download.sourceforge.net/project/numpy/NumPy/1.9.0/numpy-1.9.0.tar.gz"
+MD5SUM="a93dfc447f3ef749b31447084839930b"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""
 REQUIRES=""