diff --git a/antlr3c.changes b/antlr3c.changes
index 8112723..19bbdca 100644
--- a/antlr3c.changes
+++ b/antlr3c.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sat Feb  6 12:00:03 UTC 2016 - mpluskal@suse.com
+
+- Use optflags when building
+- Update usage of provides/obsoletes
+
 -------------------------------------------------------------------
 Thu Jan  8 19:31:55 UTC 2015 - jengelh@inai.de
 
diff --git a/antlr3c.spec b/antlr3c.spec
index 3424fb9..95756fc 100644
--- a/antlr3c.spec
+++ b/antlr3c.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package antlr3c
 #
-# Copyright (c) 2015 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2016 SUSE LINUX GmbH, Nuernberg, Germany.
 # Copyright (c) 2014 Mariusz Fik <fisiu@opensuse.org>.
 #
 # All modifications and additions to the file contributed by third parties
@@ -46,8 +46,8 @@ translation, error recovery, and error reporting.
 Summary:        C runtime for the ANTLR parsing library
 Group:          System/Libraries
 # From 13.3/TW201501 onwards
-Obsoletes:      libantlr3c3_4
-Provides:       libantlr3c3_4
+Obsoletes:      libantlr3c3_4 < %{version}
+Provides:       libantlr3c3_4 = %{version}
 
 %description -n %{soname}
 ANTLR, ANother Tool for Language Recognition, is a language tool that provides a
@@ -77,17 +77,16 @@ develop programs using the antlr3c library.
 %patch2 -p1
 
 %build
-autoreconf -fvi
+autoreconf -fiv
 %configure \
-    --disable-static
-make %{?_smp_mflags}
+  --disable-static
+make %{?_smp_mflags} CFLAGS="%{optflags}"
 
 %install
 %make_install
 find %{buildroot} -type f -name "*.la" -delete -print
 
 %post -n %{soname} -p /sbin/ldconfig
-
 %postun -n %{soname} -p /sbin/ldconfig
 
 %files -n %{soname}