See Gentoo bug #322351.

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,6 +99,9 @@ include_directories(
     ${KDEPIMLIBS_INCLUDE_DIRS}
 )
 
+# Pull in ARM configuration options if needed
+STRING(REGEX MATCH "PyQt_qreal_double" SIP_ARM_HACK ${PYQT4_SIP_FLAGS} "")
+
 set(SIP_INCLUDES ${CMAKE_BINARY_DIR} ${PYQT4_SIP_DIR} sip)
 set(SIP_CONCAT_PARTS 8)
 if (WIN32)
@@ -106,7 +109,7 @@ if (WIN32)
 else ()
     set(SIP_TAGS ALL WS_X11 ${PYQT4_VERSION_TAG})
 endif ()
-set(SIP_DISABLE_FEATURES VendorID PyQt_NoPrintRangeBug)
+set(SIP_DISABLE_FEATURES VendorID PyQt_NoPrintRangeBug ${SIP_ARM_HACK})
 
 set(SIP_FILES_INSTALL_DIR ${SHARE_INSTALL_PREFIX}/sip)