new file: g/GCC/GCC-4.9.3-tf.eb

modified:   l/LibTIFF/LibTIFF-4.0.7.eb
	modified:   p/Python/Python-2.7.13.eb
	modified:   p/Python/Python-3.6.1.eb

g/GCC/GCC-4.9.3-tf.eb

@@ -0,0 +1,45 @@
+name = "GCC"
+version = '4.9.3'
+versionsuffix = '-tf'
+
+homepage = 'http://gcc.gnu.org/'
+description = """The GNU Compiler Collection includes front ends for C, C++, Objective-C, Fortran, Java, and Ada,
+ as well as libraries for these languages (libstdc++, libgcj,...)."""
+
+toolchain = {'name': 'dummy', 'version': 'dummy'}
+
+mpfr_version = '3.1.2'
+
+source_urls = [
+    'http://ftpmirror.gnu.org/%(namelower)s/%(namelower)s-%(version)s',  # GCC auto-resolving HTTP mirror
+    'http://ftpmirror.gnu.org/gmp',  # idem for GMP
+    'http://ftpmirror.gnu.org/mpfr',  # idem for MPFR
+    'http://www.multiprecision.org/mpc/download',  # MPC official
+]
+sources = [
+    SOURCELOWER_TAR_BZ2,
+    'gmp-6.0.0a.tar.bz2',
+    'mpfr-%s.tar.gz' % mpfr_version,
+    'mpc-1.0.2.tar.gz',
+]
+
+patches = [('mpfr-%s-allpatches-20141204.patch' % mpfr_version, '../mpfr-%s' % mpfr_version)]
+
+checksums = [
+    '6f831b4d251872736e8e9cc09746f327',     # gcc-4.9.3.tar.bz2
+    'b7ff2d88cae7f8085bd5006096eed470',     # gmp-6.0.0a.tar.bz2
+    '181aa7bb0e452c409f2788a4a7f38476',     # mpfr-3.1.2.tar.gz
+    '68fadff3358fb3e7976c7a398a0af4c3',     # mpc-1.0.2.tar.gz
+    '58aec98d15982f9744a043d2f1c5af82',     # mpfr-3.1.2-allpatches-20141204.patch
+]
+
+configopts = '--with-ld=/usr/bin/ld '
+configopts += '--with-nm=/usr/bin/nm '
+configopts += '--with-as=/usr/bin/as '
+
+languages = ['c', 'c++', 'fortran']
+
+# building GCC sometimes fails if make parallelism is too high, so let's limit it
+maxparallel = 4
+
+moduleclass = 'compiler'

l/LibTIFF/LibTIFF-4.0.7.eb

@@ -14,7 +14,7 @@ easyblock = 'ConfigureMake'
 name = 'LibTIFF'
 version = '4.0.7'
 
-homepage = 'http://www.remotesensing.org/libtiff/'
+homepage = 'http://download.osgeo.org/libtiff/'
 description = "tiff: Library and tools for reading and writing TIFF data files"
 
 source_urls = ['ftp://ftp.remotesensing.org/pub/libtiff/']

p/Python/Python-2.7.13.eb

@@ -16,9 +16,9 @@ sources = [SOURCE_TGZ]
 dependencies = [
     ('bzip2', '1.0.6'),
     ('zlib', '1.2.11'),
-    ('libreadline', '6.3'),
+    ('libreadline', '7.0'),
     ('ncurses', '6.0'),
-    ('SQLite', '3.13.0'),
+    ('SQLite', '3.17.0'),
 #   ('OpenSSL', '1.0.1k'),  # OS dependency should be preferred if the os version is more recent then this version, it's
 #   nice to have an up to date openssl for security reasons
 ]

p/Python/Python-3.6.1.eb

@@ -13,11 +13,11 @@ sources = [SOURCE_TGZ]
 # python needs bzip2 to build the bz2 package
 dependencies = [
     ('bzip2', '1.0.6'),
-    ('libreadline', '6.3'),
-    ('SQLite', '3.13.0'),
-    ('Tk', '8.6.5'),
-    ('GMP', '6.1.1'),
-    ('XZ', '5.2.2'),
+    ('libreadline', '7.0'),
+    ('SQLite', '3.17.0'),
+    ('Tk', '8.6.6'),
+    ('GMP', '6.1.2'),
+    ('XZ', '5.2.3'),
     ('zlib', '1.2.11'),
     ('ncurses', '6.0'),
 #   ('OpenSSL', '1.0.1q'),  # OS dependency should be preferred if the os version is more recent then this version, it's