diff --git a/spdlog.spec b/spdlog.spec
index 765fbb3..4b3e62a 100644
--- a/spdlog.spec
+++ b/spdlog.spec
@@ -1,6 +1,6 @@
 Name:          spdlog
 Version:       1.12.0
-Release:       1mamba
+Release:       2mamba
 Summary:       Fast C++ logging library
 Group:         System/Libraries
 Vendor:        openmamba
@@ -11,6 +11,7 @@ Source:        https://github.com/gabime/spdlog.git/v%{version}/spdlog-%{version
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
+BuildRequires: libfmt-devel
 BuildRequires: libgcc
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
@@ -42,9 +43,12 @@ This package contains libraries and header files for developing applications tha
 
 %prep
 %setup -q
+#%patch 0 -p1 -b .fmt_external
 
 %build
-%cmake -d build
+%cmake -d build \
+   -DSPDLOG_FMT_EXTERNAL=ON
+
 %make
 
 %install
@@ -70,6 +74,9 @@ This package contains libraries and header files for developing applications tha
 %doc README.md
 
 %changelog
+* Sat Aug 26 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 1.12.0-2mamba
+- rebuilt with external libfmt
+
 * Mon Jul 10 2023 Automatic Build System <autodist@mambasoft.it> 1.12.0-1mamba
 - automatic version update by autodist