diff --git a/config.project b/config.project
index 96b9687..6016ba0 100644
--- a/config.project
+++ b/config.project
@@ -1,12 +1,12 @@
 # project
-mb_package=python2.7
+mb_package=
 mb_require_out_of_tree=no
 mb_custom_install_headers=no
 mb_avoid_version=no
 
 # pkgconfig
-mb_pkgname='python2.7'
-mb_pkgdesc='python2.7'
+mb_pkgname=
+mb_pkgdesc=
 mb_pkgusrc=
 mb_pkgrepo='git://midipix.org/sbpython2'
 mb_pkgpsrc=
diff --git a/project/config/cfgdefs.in b/project/config/cfgdefs.in
new file mode 100644
index 0000000..7a96696
--- /dev/null
+++ b/project/config/cfgdefs.in
@@ -0,0 +1,7 @@
+# project-specific configuration
+PYTHON_VER      = @python_ver@
+PYTHON_MAJOR    = @python_major@
+PYTHON_MINOR    = @python_minor@
+PYTHON_MICRO    = @python_micro@
+PYTHON_SOABI    = cpython-$(PYTHON_MAJOR)$(PYTHON_MINOR)-$(CCHOST)
+
diff --git a/project/config/cfgdefs.sh b/project/config/cfgdefs.sh
index 054e536..ad5e9eb 100644
--- a/project/config/cfgdefs.sh
+++ b/project/config/cfgdefs.sh
@@ -35,6 +35,47 @@ cfgdefs_set_cfghost_flavors()
 }
 
 
+cfgdefs_detect_python_version()
+{
+	mb_internal_verinfo=$(mktemp)
+
+	if [ -z "$mb_internal_verinfo" ]; then
+		exit 2
+	fi
+
+	"$mb_native_cc" -E -dM "$mb_source_dir/Include/patchlevel.h" \
+		> "$mb_internal_verinfo"
+
+	python_major=$(grep '#define PY_MAJOR_VERSION ' "$mb_internal_verinfo" | cut -d' ' -f3)
+	python_minor=$(grep '#define PY_MINOR_VERSION ' "$mb_internal_verinfo" | cut -d' ' -f3)
+	python_micro=$(grep '#define PY_MICRO_VERSION ' "$mb_internal_verinfo" | cut -d' ' -f3)
+
+	if [ -z "$python_major" ] || [ -z "$python_minor" ] || [ -z "$python_micro" ]; then
+		error_msg "Could not properly parse Python's patchlevel.h"
+		exit 2
+	fi
+
+	python_ver="$python_major.$python_minor"
+
+	[ -z "$mb_package"  ] && mb_package='python'"$python_ver"
+	[ -z "$mb_nickname" ] && mb_nickname="$mb_package"
+	[ -z "$mb_pkgname"  ] && mb_pkgname="$mb_package"
+	[ -z "$mb_pkgdesc"  ] && mb_pkgdesc="$mb_package"
+}
+
+
+cfgdefs_output_custom_defs()
+{
+	sed \
+			-e 's/@python_ver@/'"$python_ver"'/g'       \
+			-e 's/@python_major@/'"$python_major"'/g'   \
+			-e 's/@python_minor@/'"$python_minor"'/g'   \
+			-e 's/@python_micro@/'"$python_micro"'/g'   \
+		"$mb_project_dir/project/config/cfgdefs.in"         \
+			>> "$mb_pwd/cfgdefs.mk"
+}
+
+
 cfgdefs_perform_target_tests()
 {
 	# init
@@ -141,6 +182,12 @@ cfgdefs_perform_native_tests()
 # cfghost
 cfgdefs_set_cfghost_flavors
 
+# python version info
+cfgdefs_detect_python_version
+
+# cfgdefs.in --> cfgdefs.mk
+cfgdefs_output_custom_defs
+
 # target-specific tests
 cfgdefs_perform_target_tests
 
diff --git a/project/extras.mk b/project/extras.mk
index c120e99..e3a161d 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -1,7 +1,4 @@
 # build info
-PYTHON_VER     = 2.7
-PYTHON_MAJOR   = 2
-
 CFLAGS_COMMON += -I$(PROJECT_DIR)/profiles
 CFLAGS_COMMON += -I$(SOURCE_DIR)/Include