diff --git a/ska_conda/pkg_defs/ska3-core/combine_arch.py b/ska_conda/pkg_defs/ska3-core/combine_arch.py
new file mode 100644
index 00000000..0d38d2fa
--- /dev/null
+++ b/ska_conda/pkg_defs/ska3-core/combine_arch.py
@@ -0,0 +1,43 @@
+import json
+import argparse
+import numpy as np
+from distutils.version import LooseVersion
+
+parser = argparse.ArgumentParser(description="Make a combined arch-specific core package list")
+parser.add_argument("--linux",
+                    help="conda list json file with list of linux packages")
+parser.add_argument("--osx",
+                    help="conda list json file with list of osx packages")
+parser.add_argument("--out",
+                    help="filename for output file with combined list of files"
+                    " for use in metapackage ")
+args = parser.parse_args()
+
+
+def core_pkgs(pkgs):
+    # This defines the "core" packages as everything that came from defaults
+    # channel except the conda (conda, conda-build, conda-env, etc) packages
+    core = {p['name']:p['version'] for p in pkgs if ((p['channel'] == 'defaults')
+                                                     & (not p['name'].startswith('conda')))}
+    return core
+
+pkgs = {'linux': core_pkgs(json.load(open(args.linux))),
+        'osx': core_pkgs(json.load(open(args.osx)))}
+
+full = np.unique(list(pkgs['linux']) + list(pkgs['osx']))
+
+pkglist = []
+for p in full:
+    # For packages that are automatically installed (by dependency request) on both
+    # OSes, here we've just selected the minimum version to require.  The actual set of 
+    # packages still needs to be tested after creation.
+    if p in pkgs['linux'] and p in pkgs['osx']:
+        versions = [pkgs['linux'][p], pkgs['osx'][p]]
+        versions.sort(key=LooseVersion)
+        pkglist.append("   - {} =={}".format(p, versions[0]))
+    if p in pkgs['linux'] and p not in pkgs['osx']:
+        pkglist.append("   - {} =={} [linux]".format(p, pkgs['linux'][p]))
+    if p in pkgs['osx'] and p not in pkgs['linux']:
+        pkglist.append("   - {} =={} [osx]".format(p, pkgs['osx'][p]))
+
+open(args.out, 'w').write("\n".join(pkglist))
diff --git a/ska_conda/pkg_defs/ska3-core/meta.yaml b/ska_conda/pkg_defs/ska3-core/meta.yaml
index fada7593..9ad150d2 100644
--- a/ska_conda/pkg_defs/ska3-core/meta.yaml
+++ b/ska_conda/pkg_defs/ska3-core/meta.yaml
@@ -1,47 +1,51 @@
 package:
   name: ska3-core
-  version: 2018.07.16
-
-build:
-  noarch: generic
+  version: 2018.07.26
 
 requirements:
   # Packages required to run the package. These are the dependencies that
   # will be installed automatically whenever the package is installed.
   run:
+   - _nb_ext_conf ==0.4.0
    - alabaster ==0.7.10
+   - anaconda-client ==1.6.3
+   - appnope ==0.1.0 [osx]
    - asn1crypto ==0.22.0
    - astroid ==1.5.3
    - astropy ==2.0.1
    - babel ==2.5.0
    - beautifulsoup4 ==4.6.0
+   - bkcharts ==0.2
    - bleach ==1.5.0
+   - bokeh ==0.12.7
    - certifi ==2016.2.28
-   - cffi ==1.9.1
+   - cffi ==1.10.0
    - chardet ==3.0.4
+   - clyent ==1.2.2
    - configobj ==5.0.6
    - cryptography ==1.8.1
    - curl ==7.54.1
    - cycler ==0.10.0
    - cython ==0.26
-   - db ==5.3.28
-   - dbus ==1.10.20
+   - dbus ==1.10.20 [linux]
    - decorator ==4.1.2
    - django ==1.11.3
    - docutils ==0.14
    - entrypoints ==0.2.3
    - expat ==2.1.0
-   - fontconfig ==2.12.1
+   - fontconfig ==2.12.1 [linux]
    - freetype ==2.5.5
    - git ==2.11.1
-   - glib ==2.50.2
-   - gst-plugins-base ==1.8.0
-   - gstreamer ==1.8.0
+   - gitdb2 ==2.0.0
+   - gitpython ==2.1.3
+   - glib ==2.50.2 [linux]
+   - gst-plugins-base ==1.8.0 [linux]
+   - gstreamer ==1.8.0 [linux]
    - h5py ==2.7.0
    - hdf5 ==1.8.17
-   - html5lib ==0.9999999
+   - html5lib ==0.999
    - icu ==54.1
-   - idna ==2.2
+   - idna ==2.6
    - imagesize ==0.7.1
    - ipykernel ==4.6.1
    - ipyparallel ==6.0.2
@@ -60,28 +64,28 @@ requirements:
    - jupyter_core ==4.3.0
    - krb5 ==1.13.2
    - lazy-object-proxy ==1.3.1
-   - libffi ==3.2.1
+   - libffi ==3.2.1 [linux]
    - libgcc ==4.8.5
    - libgfortran ==3.0.0
-   - libiconv ==1.14
+   - libiconv ==1.14 [linux]
    - libpng ==1.6.30
-   - libsodium ==1.0.10
+   - libsodium ==1.0.10 [linux]
    - libssh2 ==1.8.0
    - libtiff ==4.0.6
-   - libxcb ==1.12
-   - libxml2 ==2.9.4
-   - libxslt ==1.1.29
+   - libxcb ==1.12 [linux]
+   - libxml2 ==2.9.4 [linux]
    - line_profiler ==2.0
    - llvmlite ==0.18.0
-   - lxml ==3.8.0
    - markupsafe ==1.0
    - matplotlib ==2.0.2
    - mistune ==0.7.4
    - mkl ==2017.0.3
-   - mpi4py ==2.0.0
-   - mpich2 ==1.4.1p1
+   - nb_anacondacloud ==1.4.0
+   - nb_conda ==2.2.0
+   - nb_conda_kernels ==2.1.0
    - nbconvert ==5.2.1
    - nbformat ==4.4.0
+   - nbpresent ==3.0.2
    - networkx ==1.11
    - nose ==1.3.7
    - notebook ==5.0.0
@@ -96,32 +100,30 @@ requirements:
    - pandocfilters ==1.4.2
    - paramiko ==2.1.2
    - path.py ==10.3.1
-   - pcre ==8.39
+   - pcre ==8.39 [linux]
    - pep8 ==1.7.0
    - pexpect ==4.2.1
    - pickleshare ==0.7.4
    - pillow ==4.2.1
    - pip ==9.0.1
-   - ply ==3.10
    - prompt_toolkit ==1.0.15
    - psutil ==5.2.2
    - ptyprocess ==0.5.2
    - py ==1.4.34
-   - pyasn1 ==0.1.9
+   - pyasn1 ==0.2.3
    - pycodestyle ==2.3.1
-   - pycosat ==0.6.1
-   - pycparser ==2.17
+   - pycparser ==2.18
    - pycrypto ==2.6.1
    - pyflakes ==1.6.0
    - pygments ==2.2.0
    - pylint ==1.7.2
-   - pyopenssl ==16.2.0
    - pyparsing ==2.2.0
    - pyqt ==5.6.0
    - pytables ==3.4.2
    - pytest ==3.2.1
    - python ==3.6.2
    - python-dateutil ==2.6.1
+   - python.app ==1.2 [osx]
    - pytz ==2017.2
    - pyyaml ==3.12
    - pyzmq ==16.0.2
@@ -132,7 +134,6 @@ requirements:
    - readline ==6.2
    - requests ==2.14.2
    - rope ==0.9.4
-   - ruamel_yaml ==0.11.14
    - runipy ==0.1.5
    - scikit-learn ==0.19.0
    - scipy ==0.19.1
@@ -141,12 +142,12 @@ requirements:
    - singledispatch ==3.4.0.3
    - sip ==4.18
    - six ==1.10.0
+   - smmap2 ==2.0.1
    - snowballstemmer ==1.2.1
    - sphinx ==1.6.3
    - sphinxcontrib ==1.0
    - sphinxcontrib-websupport ==1.0.1
    - spyder ==3.2.3
-   - sqlalchemy ==1.1.13
    - sqlite ==3.13.0
    - terminado ==0.6
    - testpath ==0.3.1
@@ -157,8 +158,8 @@ requirements:
    - wheel ==0.29.0
    - widgetsnbextension ==3.0.2
    - wrapt ==1.10.11
-   - xz ==5.2.2
+   - xz ==5.2.3
    - yaml ==0.1.6
-   - zeromq ==4.1.5
+   - zeromq ==4.1.3 [osx]
+   - zeromq ==4.1.5 [linux]
    - zlib ==1.2.11
-
diff --git a/ska_conda/pkg_defs/ska3-dev/meta.yaml b/ska_conda/pkg_defs/ska3-dev/meta.yaml
index 91091c18..6bb60300 100644
--- a/ska_conda/pkg_defs/ska3-dev/meta.yaml
+++ b/ska_conda/pkg_defs/ska3-dev/meta.yaml
@@ -1,6 +1,6 @@
 package:
   name: ska3-dev
-  version: 0.1
+  version: 0.1.3
 
 build:
   noarch: generic
@@ -9,190 +9,87 @@ requirements:
   # Packages required to run the package. These are the dependencies that
   # will be installed automatically whenever the package is installed.
   run:
+  # Ska packages
    - agasc
-   - alabaster
    - annie
-   - asn1crypto
-   - astroid
-   - astropy
-   - babel
-   - beautifulsoup4
-   - bleach
-   - certifi
-   - cffi
    - chandra.cmd_states
    - chandra.maneuver
    - chandra.time
    - chandra_aca
-   - chardet
-   - configobj
-   - cryptography
-   - curl
    - cxotime
-   - cycler
+   - hopper
+   - kadi
+   - maude
+   - mica
+   - parse_cm
+   - quaternion
+   - ska.arc5gl
+   - ska.astro
+   - ska.dbi
+   - ska.engarchive
+   - ska.file
+   - ska.ftp
+   - ska.matplotlib
+   - ska.numpy
+   - ska.parsecm
+   - ska.quatutil
+   - ska.shell
+   - ska.sun
+   - ska.tdb
+   - ska3-template
+   - ska_path
+   - pyyaks
+   - tables3_api
+   - testr
+   - xija
+  # Installed from Ska
+   - sherpa
+  # Core packages that we want whether or not they are dependencies of Ska packages
+   - astropy
+   - beautifulsoup4
+   - bokeh
    - cython
-   - db
-   - dbus
-   - decorator
    - django
-   - docutils
-   - entrypoints
-   - expat
-   - fontconfig
-   - freetype
    - git
-   - glib
-   - gst-plugins-base
-   - gstreamer
+   - gitpython
    - h5py
    - hdf5
-   - hopper
-   - html5lib
-   - icu
-   - idna
-   - imagesize
-   - ipykernel
-   - ipyparallel
    - ipython
-   - ipython_genutils
-   - ipywidgets
-   - isort
-   - jbig
-   - jedi
    - jinja2
-   - jpeg
-   - jsonschema
    - jupyter
    - jupyter_client
    - jupyter_console
-   - jupyter_core
-   - kadi
-   - krb5
-   - lazy-object-proxy
-   - libffi
-   - libgcc
-   - libgfortran
-   - libiconv
-   - libpng
-   - libsodium
-   - libssh2
-   - libtiff
-   - libxcb
-   - libxml2
-   - libxslt
    - line_profiler
    - llvmlite
-   - lxml
-   - markupsafe
    - matplotlib
-   - maude
-   - mica
-   - mistune
-   - mkl
-   - mpi4py
-   - mpich2
+   - nb_conda
    - nbconvert
-   - nbformat
    - networkx
-   - nose
    - notebook
    - numba
    - numexpr
    - numpy
    - numpydoc
-   - olefile
    - openssl
-   - packaging
    - pandas
-   - pandocfilters
-   - paramiko
-   - parse_cm
-   - path.py
-   - pcre
    - pep8
-   - pexpect
-   - pickleshare
    - pillow
    - pip
-   - ply
-   - prompt_toolkit
-   - psutil
-   - ptyprocess
-   - py
-   - pyasn1
-   - pycodestyle
-   - pycosat
-   - pycparser
-   - pycrypto
    - pyflakes
-   - pygments
    - pylint
-   - pyopenssl
-   - pyparsing
-   - pyqt
-   - pytables
-   - pytest
-   - python
-   - python-dateutil
-   - pytz
-   - pyyaks
    - pyyaml
-   - pyzmq
    - qt
-   - qtawesome
    - qtconsole
-   - qtpy
-   - quaternion
    - readline
    - requests
-   - rope
-   - ruamel_yaml
    - runipy
    - scikit-learn
    - scipy
    - setuptools
-   - sherpa
-   - simplegeneric
-   - singledispatch
-   - sip
    - six
-   - ska.arc5gl
-   - ska.astro
-   - ska.dbi
-   - ska.engarchive
-   - ska.file
-   - ska.ftp
-   - ska.matplotlib
-   - ska.numpy
-   - ska.parsecm
-   - ska.quatutil
-   - ska.shell
-   - ska.sun
-   - ska.tdb
-   - ska3-core
-   - ska3-flight
-   - ska3-template
-   - ska_path
-   - snowballstemmer
    - sphinx
-   - sphinxcontrib
-   - sphinxcontrib-websupport
    - spyder
-   - sqlalchemy
    - sqlite
-   - tables3_api
-   - terminado
-   - testpath
-   - testr
    - tk
-   - tornado
-   - traitlets
-   - wcwidth
-   - wheel
-   - widgetsnbextension
-   - wrapt
-   - xija
-   - xz
    - yaml
    - zeromq
-   - zlib
diff --git a/ska_conda/pkg_defs/ska3-flight/meta.yaml b/ska_conda/pkg_defs/ska3-flight/meta.yaml
index 32c93de0..d6f2daa2 100644
--- a/ska_conda/pkg_defs/ska3-flight/meta.yaml
+++ b/ska_conda/pkg_defs/ska3-flight/meta.yaml
@@ -1,6 +1,6 @@
 package:
   name: ska3-flight
-  version: 2018.07.16
+  version: 2018.07.26
 
 build:
   noarch: generic
@@ -9,7 +9,7 @@ requirements:
   # Packages required to run the package. These are the dependencies that
   # will be installed automatically whenever the package is installed.
   run:
-    - ska3-core ==2018.07.16
+    - ska3-core ==2018.07.26
     - ska3-template ==0.1
     - agasc ==3.5.2
     - annie ==0.5
diff --git a/ska_conda/pkg_defs/ska3-pinned/meta.yaml b/ska_conda/pkg_defs/ska3-pinned/meta.yaml
index 3865fae7..c11833af 100644
--- a/ska_conda/pkg_defs/ska3-pinned/meta.yaml
+++ b/ska_conda/pkg_defs/ska3-pinned/meta.yaml
@@ -1,6 +1,6 @@
 package:
   name: ska3-pinned
-  version: 2018.07.16
+  version: 2018.07.24
 
 build:
   noarch: generic
@@ -12,5 +12,4 @@ requirements:
     - python ==3.6.2
     - pip <10.0
     - numpy ==1.12.1
-    - conda ==4.3.21
     - llvmlite ==0.18.0
diff --git a/ska_conda/pkg_defs/ska3_builder/meta.yaml b/ska_conda/pkg_defs/ska3_builder/meta.yaml
index 999a629e..5aedc9fd 100644
--- a/ska_conda/pkg_defs/ska3_builder/meta.yaml
+++ b/ska_conda/pkg_defs/ska3_builder/meta.yaml
@@ -24,8 +24,10 @@ requirements:
     - ipython
     - gitpython
     - git
+    - conda ==4.3.21
     - conda-build
-    - ska3-pinned ==2018.07.16
+    - conda-verify
+    - ska3-pinned ==2018.07.24
 
 about:
   home: https://github.com/sot/skare3