See Gentoo bug #322351.

--- CMakeLists.txt
+++ CMakeLists.txt
@@ -101,6 +101,8 @@
     ${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 ${PYQT4_SIP_DIR} sip)
 set(SIP_CONCAT_PARTS 8)
 if (WIN32)
@@ -108,7 +110,7 @@
 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})
 
 # Use an extra option when compiling on Python 3.
 if (PYTHON_VERSION_MAJOR GREATER 2)