diff --git a/rear.spec b/rear.spec
index 736c69b..aff8627 100644
--- a/rear.spec
+++ b/rear.spec
@@ -183,8 +183,6 @@ Requires: xorriso
 Requires: util-linux
 %endif
 
-Requires(post): /etc/os-release
-
 %description
 Relax-and-Recover is the leading Open Source disaster recovery and system
 migration solution. It comprises of a modular
@@ -209,6 +207,10 @@ Professional services and support are available.
 %prep
 %autosetup -p1 -S git
 
+### Add a specific os.conf so we do not depend on LSB dependencies
+%{?fedora:echo -e "OS_VENDOR=Fedora\nOS_VERSION=%{?fedora}" >etc/rear/os.conf}
+%{?rhel:echo -e "OS_VENDOR=RedHatEnterpriseServer\nOS_VERSION=%{?rhel}" >etc/rear/os.conf}
+
 # Change /lib to /usr/lib for COPY_AS_IS
 sed -E -e "s:([\"' ])/lib:\1/usr/lib:g" \
     -i usr/share/rear/prep/GNU/Linux/*include*.sh
@@ -236,20 +238,11 @@ install -m 0644 %{SOURCE1} %{buildroot}%{_docdir}/%{name}/
 install -m 0644 %{SOURCE2} %{buildroot}%{_docdir}/%{name}/
 install -m 0644 %{SOURCE3} %{buildroot}%{_docdir}/%{name}/
 
-%post
-# Regenerate /etc/rear/os.conf file after install.  Otherwise, it will
-# contain stale information after system upgrade.
-cat > %{_sysconfdir}/rear/os.conf <<EOF
-OS_VENDOR=%{?fedora:Fedora}%{?rhel:RedHatEnterpriseServer}
-OS_VERSION=$(. /etc/os-release; echo $VERSION_ID)
-EOF
-
 #-- FILES ---------------------------------------------------------------------#
 %files
 %license COPYING
 %doc MAINTAINERS README.adoc doc/*.txt doc/user-guide/*.html
 %config(noreplace) %{_sysconfdir}/rear/local.conf
-%ghost %{_sysconfdir}/rear/os.conf
 %{_datadir}/rear/
 %{_docdir}/%{name}/rear.*
 %{_mandir}/man8/rear.8*