File project.diff of Package json-c

--- json-c.spec	2020-10-25 10:40:23.494320598 +0100
+++ json-c.spec	2020-10-25 10:43:26.391717374 +0100
@@ -67,6 +67,22 @@
 This package includes header files and scripts needed for developers
 using the json-c library
 
+%package -n %{libname}-devel-static
+Summary:        Development headers and libraries for json-c
+Group:          Development/Libraries/C and C++
+Requires:       %{libname}-devel = %{version}
+Provides:       %{oldlibname}-devel-static = %{version}
+Obsoletes:      %{oldlibname}-devel-static < %{version}
+
+%description -n %{libname}-devel-static
+JSON-C implements a reference counting object model that allows you to
+easily construct JSON objects in C, output them as JSON formatted
+strings and parse JSON formatted strings back into the C
+representation of JSON objects.
+
+This package includes the static library needed for developers
+using the json-c library
+
 %package -n %{libname}-doc
 Summary:        Documentation files
 Group:          Documentation/Other
@@ -97,6 +113,7 @@
     -DCMAKE_INSTALL_PREFIX=%{_prefix} \
     -DCMAKE_INSTALL_LIBDIR=%{_libdir} \
     -DENABLE_THREADING=ON \
+    -DBUILD_STATIC_LIBS=on \
     -DENABLE_RDRAND=ON
 
 %check
@@ -128,6 +145,9 @@
 %{_libdir}/cmake/json-c/json-c-targets-none.cmake
 %{_libdir}/cmake/json-c/json-c-targets.cmake
 
+%files -n %{libname}-devel-static
+%{_libdir}/%{libname}.a
+
 %files -n %{libname}-doc
 %license COPYING
 %doc AUTHORS ChangeLog README README.html