diff --git a/ModemManager.spec b/ModemManager.spec
index 3dbb44b..4e0b867 100644
--- a/ModemManager.spec
+++ b/ModemManager.spec
@@ -1,7 +1,7 @@
 %define majver %(echo %version | cut -d. -f1-2)
 Name:          ModemManager
 Epoch:         1
-Version:       1.16.2
+Version:       1.16.4
 Release:       1mamba
 Summary:       Provides a DBus interface to communicate with mobile broadband (GSM, CDMA, UMTS, …) cards
 Group:         Applications/Networking
@@ -13,7 +13,6 @@ Source:        http://www.freedesktop.org/software/ModemManager/ModemManager-%{v
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: ldconfig
 BuildRequires: libglib-devel
 BuildRequires: libgudev-devel
 BuildRequires: libmbim-devel
@@ -45,7 +44,7 @@ Group:         Development/Libraries
 Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 Requires:      libmm = %{?epoch:%epoch:}%{version}-%{release}
 Provides:      ModemManager-devel
-Obsoletes:     ModemManager-devel
+Obsoletes:     ModemManager-devel < 1:1.16.4
 
 %description -n libmm-devel
 ModemManager provides a DBus interface to communicate with mobile broadband (GSM, CDMA, UMTS, …) cards. Implements a loadable plugin interface to add work-arounds for non standard devices.
@@ -57,7 +56,9 @@ This package contains static libraries and header files needed for development.
 %setup -q
 
 %build
-%configure
+%configure \
+   --with-udev-base-dir=%{_prefix}/lib/udev
+
 %make
 
 %install
@@ -126,6 +127,9 @@ This package contains static libraries and header files needed for development.
 %{_libdir}/pkgconfig/mm-glib.pc
 
 %changelog
+* Sat Apr 24 2021 Automatic Build System <autodist@mambasoft.it> 1.16.4-1mamba
+- automatic version update by autodist
+
 * Wed Mar 03 2021 Automatic Build System <autodist@mambasoft.it> 1.16.2-1mamba
 - automatic version update by autodist