try fixing sphinx-build --version detection in configure

https://github.com/ghc/ghc/pull/143

ghc-configure-fix-sphinx-version-check.patch

@@ -0,0 +1,11 @@
+--- ghc-8.2.2/configure.ac~	2017-11-21 05:22:42.000000000 +0900
++++ ghc-8.2.2/configure.ac	2018-05-28 12:37:35.296728423 +0900
+@@ -745,7 +745,7 @@
+ AC_CACHE_CHECK([for version of sphinx-build], fp_cv_sphinx_version,
+ changequote(, )dnl
+ [if test -n "$SPHINXBUILD"; then
+-  fp_cv_sphinx_version=`"$SPHINXBUILD" --version 2>&1 | sed 's/Sphinx\( (sphinx-build)\)\? v\?\([0-9]\.[0-9]\.[0-9]\)/\2/' | head -n1`;
++  fp_cv_sphinx_version=`"$SPHINXBUILD" --version 2>&1 | sed 's/.* v\?\([0-9]\.[0-9]\.[0-9]\)/\1/' | head -n1`;
+ fi;
+ changequote([, ])dnl
+ ])

ghc.spec

@@ -41,6 +41,8 @@ Patch2:  ghc-Cabal-install-PATH-warning.patch
 # https://ghc.haskell.org/trac/ghc/ticket/14381
 # https://phabricator.haskell.org/D4159
 Patch4:  D4159.patch
+# https://github.com/ghc/ghc/pull/143
+Patch5:  ghc-configure-fix-sphinx-version-check.patch
 
 Patch12: ghc-armv7-VFPv3D16--NEON.patch
 
@@ -81,11 +83,14 @@ BuildRequires: perl-interpreter
 BuildRequires: python3
 %endif
 %if %{with manual}
-BuildRequires: python3-sphinx
+# for /usr/bin/sphinx-build
+BuildRequires: python2-sphinx
 %endif
 %ifarch armv7hl aarch64
 BuildRequires: llvm%{llvm_major}
 %endif
+# patch5
+BuildRequires: autoconf
 %ifarch armv7hl
 # patch12
 BuildRequires: autoconf, automake
@@ -252,6 +257,7 @@ except the ghc library, which is installed by the toplevel ghc metapackage.
 
 %patch2 -p1 -b .orig
 %patch4 -p1 -b .orig
+%patch5 -p1 -b .orig
 
 %if 0%{?fedora} || 0%{?rhel} > 6
 rm -r libffi-tarballs
@@ -310,8 +316,12 @@ EOF
 ## (http://ghc.haskell.org/trac/ghc/wiki/Debugging/RuntimeSystem)
 #EXTRA_HC_OPTS=-debug
 
+# for patch12
 %ifarch armv7hl
 autoreconf
+%else
+# for patch5
+autoconf
 %endif
 
 %if 0%{?fedora} > 28