update sigcpp from 2.6.2 to 3.0.7

scram-tools.file/tools/sigcpp/sigcpp.xml

@@ -1,9 +1,9 @@
 <tool name="sigcpp" version="@TOOL_VERSION@">
-  <lib name="sigc-2.0"/>
+  <lib name="sigc-3.0"/>
   <client>
     <environment name="SIGCPP_BASE" default="@TOOL_ROOT@"/>
     <environment name="LIBDIR" default="$SIGCPP_BASE/lib"/>
-    <environment name="INCLUDE" default="$SIGCPP_BASE/include/sigc++-2.0"/>
+    <environment name="INCLUDE" default="$SIGCPP_BASE/include/sigc++-3.0"/>
   </client>
   <runtime name="ROOT_INCLUDE_PATH" value="$INCLUDE" type="path"/>
   <use name="root_cxxdefaults"/>

sigcpp.spec

@@ -1,26 +1,29 @@
-### RPM external sigcpp 2.6.2
-%define majorv %(echo %{realversion} | cut -d. -f1,2)
-Source: http://ftp.gnome.org/pub/GNOME/sources/libsigc++/%{majorv}/libsigc++-%{realversion}.tar.xz
+### RPM external sigcpp 3.0.7
+Source: https://github.com/libsigcplusplus/libsigcplusplus/archive/refs/tags/%{realversion}.tar.gz
 
-BuildRequires: autotools
+BuildRequires: cmake
 
 %prep
-%setup -q -n libsigc++-%{realversion}
-./configure --prefix=%{i} --disable-static
+%setup -q -n libsigcplusplus-%{realversion}
 
 %build
+rm -rf ../build ; mkdir ../build ; cd ../build
+cmake ../libsigcplusplus-%{realversion} \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_INSTALL_PREFIX="%{i}"
 make %{makeprocesses}
 
 %install
+cd ../build
 make install
 # We remove pkg-config files for two reasons:
 # * it's actually not required (macosx does not even have it).
-# * rpm 4.8 adds a dependency on the system /usr/bin/pkg-config 
+# * rpm 4.8 adds a dependency on the system /usr/bin/pkg-config
 #   on linux.
 # In the case at some point we build a package that can be build
 # only via pkg-config we have to think on how to ship our own
 # version.
 rm -rf %{i}/lib/pkgconfig
 # Read documentation online.
 %define drop_files %{i}/share
-cp %{i}/lib/sigc++-2.0/include/sigc++config.h %{i}/include/sigc++-2.0/
+cp %{i}/lib/sigc++-3.0/include/sigc++config.h %{i}/include/sigc++-3.0/