make units_cur use Python 3

Closes #1

units.spec

@@ -1,19 +1,20 @@
 Summary: A utility for converting amounts from one unit to another
 Name: units
 Version: 2.16
-Release: 1%{?dist}
+Release: 2%{?dist}
 Source: https://ftp.gnu.org/gnu/units/%{name}-%{version}.tar.gz
 URL: https://www.gnu.org/software/units/units.html
 License: GPLv3+
 Requires(post): /sbin/install-info
 Requires(preun): /sbin/install-info
+BuildRequires: automake
 BuildRequires: bison
 BuildRequires: ncurses-devel
-BuildRequires: python
+BuildRequires: python3
 BuildRequires: readline-devel
 
 # used by the units_cur script
-Requires: python-unidecode
+Requires: python3-unidecode
 
 %description
 Units converts an amount from one unit to another, or tells you what
@@ -24,6 +25,10 @@ well as conversions such as Fahrenheit to Celsius.
 %prep
 %setup -q
 
+# make units_cur use Python 3
+sed -e 's|^AC_PATH_PROG(PYTHON, python|&3|' -i configure.ac
+autoreconf -fiv
+
 %build
 %configure
 make %{?_smp_mflags}
@@ -58,6 +63,9 @@ fi
 %{_mandir}/man1/*
 
 %changelog
+* Mon Feb 05 2018 Kamil Dudka <kdudka@redhat.com> - 2.16-2
+- make units_cur use Python 3
+
 * Wed Nov 01 2017 Kamil Dudka <kdudka@redhat.com> - 2.16-1
 - new upstream release