diff --git a/celeritas.spec b/celeritas.spec
index 355ee6bf806..ab3846b50b6 100644
--- a/celeritas.spec
+++ b/celeritas.spec
@@ -1,22 +1,11 @@
 ### RPM external celeritas v0.4.1
-## INCLUDE compilation_flags
-## INCLUDE compilation_flags_lto
-## INCLUDE cpp-standard
-## INCLUDE vecgeom-opt
-%define keep_archives true
 %define celeritas_gitversion %(echo %{realversion} | sed -e 's|^v||;s|-.*||')
 %define tag f9b51d72fc268bf22c5560b82d3dd3d7613a8106
 Source: git+https://github.com/celeritas-project/celeritas?obj=develop/%{tag}&export=%{n}-%{realversion}&output=/%{n}-%{realversion}.tgz
-BuildRequires: cmake
 
-%define build_flags -Wall -Wextra -pedantic %{?arch_build_flags} %{?lto_build_flags} %{?pgo_build_flags}
-Requires: python3
-Requires: json
-Requires: geant4
-Requires: expat xerces-c
-%if %{enable_vecgeom}
-Requires: vecgeom
-%endif
+%define package_build_flags -Wall -Wextra -pedantic
+## INCLUDE geant4-deps
+Requires: python3 json geant4
 
 %prep
 %setup -n %{n}-%{realversion}
diff --git a/dd4hep.spec b/dd4hep.spec
index 825f767a93a..221528ea44f 100644
--- a/dd4hep.spec
+++ b/dd4hep.spec
@@ -1,18 +1,12 @@
 ### RPM external dd4hep v01-29-00
-## INCLUDE compilation_flags
-## INCLUDE compilation_flags_lto
-## INCLUDE cpp-standard
-
 %define tag d119e3f8f5da75bd87632467df088197f84ed1b8
 %define branch master
 %define github_user AIDASoft
-%define keep_archives true
 
 Source: git+https://github.com/%{github_user}/DD4hep.git?obj=%{branch}/%{tag}&export=%{n}-%{realversion}&output=/%{n}-%{realversion}.tgz
-BuildRequires: cmake
-Requires: root boost clhep xerces-c expat geant4
+## INCLUDE geant4-deps
 
-%define build_flags -fPIC %{?arch_build_flags} %{?lto_build_flags} %{?pgo_build_flags}
+Requires: root boost geant4
 
 %define cmake_fixed_args \\\
   -DCMAKE_INSTALL_PREFIX='%{i}' \\\
@@ -40,7 +34,7 @@ export BOOST_ROOT
 
 #Build normal Shared D4Hep without Geant4
 rm -rf ../build; mkdir ../build; cd ../build
-cmake %{cmake_fixed_args} -DBUILD_SHARED_LIBS=ON ../%{n}-%{realversion}
+cmake %{cmake_fixed_args} -DBUILD_SHARED_LIBS=ON -DDD4HEP_USE_GEANT4=OFF ../%{n}-%{realversion}
 make %{makeprocesses} VERBOSE=1
 make install
 
diff --git a/g4hepem.spec b/g4hepem.spec
index 373b2d7e354..f4e8c172f2c 100644
--- a/g4hepem.spec
+++ b/g4hepem.spec
@@ -1,17 +1,11 @@
 ### RPM external g4hepem 20230309
-## INCLUDE compilation_flags
-## INCLUDE compilation_flags_lto
 %define tag %{realversion}
 %define branch master
 %define github_user mnovak42
 Source: git+https://github.com/%github_user/%{n}.git?obj=%{branch}/%{tag}&export=%{n}.%{realversion}&output=/%{n}.%{realversion}-%{tag}.tgz
 
-BuildRequires: cmake gmake
-
-Requires: geant4 expat xerces-c
-
-%define keep_archives true
-%define build_flags -fPIC %{?arch_build_flags} %{?lto_build_flags} %{?pgo_build_flags}
+## INCLUDE geant4-deps
+Requires: geant4
 
 %prep
 %setup -n %{n}.%{realversion}
diff --git a/geant4-deps.file b/geant4-deps.file
new file mode 100644
index 00000000000..a1c5471774d
--- /dev/null
+++ b/geant4-deps.file
@@ -0,0 +1,16 @@
+## INCLUDE compilation_flags
+## INCLUDE compilation_flags_lto
+## INCLUDE cpp-standard
+## INCLUDE vecgeom-opt
+
+BuildRequires: cmake gmake
+Requires: clhep
+Requires: expat
+Requires: xerces-c
+%if %{enable_vecgeom}
+Requires: vecgeom
+%endif
+Requires: zlib
+
+%define keep_archives true
+%define build_flags %{?package_build_flags} -fPIC %{?arch_build_flags} %{?lto_build_flags} %{?pgo_build_flags}
diff --git a/geant4.spec b/geant4.spec
index e524d7d8c29..a09794717b2 100644
--- a/geant4.spec
+++ b/geant4.spec
@@ -1,25 +1,10 @@
 ### RPM external geant4 11.2.2
-## INCLUDE compilation_flags
-## INCLUDE compilation_flags_lto
-## INCLUDE cpp-standard
-## INCLUDE vecgeom-opt
 %define tag 95f4cebf4a63598d695070bf92e47355eef94a5f
 %define branch cms/v%{realversion}
 %define github_user cms-externals
 Source: git+https://github.com/%github_user/%{n}.git?obj=%{branch}/%{tag}&export=%{n}.%{realversion}&output=/%{n}.%{realversion}-%{tag}.tgz
 
-BuildRequires: cmake gmake
-
-Requires: clhep
-Requires: expat
-Requires: xerces-c
-%if %{enable_vecgeom}
-Requires: vecgeom
-%endif
-Requires: zlib
-
-%define keep_archives true
-%define build_flags -fPIC %{?arch_build_flags} %{?lto_build_flags} %{?pgo_build_flags}
+## INCLUDE geant4-deps
 
 %prep
 %setup -n %{n}.%{realversion}