diff --git a/cmake.spec b/cmake.spec
index a29af76..c3deaf6 100644
--- a/cmake.spec
+++ b/cmake.spec
@@ -13,7 +13,7 @@
 
 Name:           cmake
 Version:        2.8.11
-Release:        0.5.rc2%{?dist}
+Release:        0.6.rc2%{?dist}
 Summary:        Cross-platform make system
 
 Group:          Development/Tools
@@ -190,6 +190,9 @@ update-mime-database %{_datadir}/mime &> /dev/null || :
 
 
 %changelog
+* Thu Apr 18 2013 Orion Poplawski <orion@cora.nwra.com> - 2.8.11-0.6.rc2
+- Drop -O3 from default release build type flags in cmake rpm macro (bug 875954)
+
 * Wed Apr 17 2013 Orion Poplawski <orion@cora.nwra.com> - 2.8.11-0.5.rc2
 - Update to 2.8.11-rc2
 - Rebase ImageMagick patch
diff --git a/macros.cmake b/macros.cmake
index bfdadb8..9ef8331 100644
--- a/macros.cmake
+++ b/macros.cmake
@@ -6,6 +6,12 @@
 %_cmake_version @@CMAKE_VERSION@@
 %__cmake /usr/bin/cmake
 
+# - Set default compile flags
+# - CMAKE_*_FLAGS_RELEASE are added *after* the *FLAGS environment variables
+# and default to -O3 -DNDEBUG.  Strip the -O3 so we can override with *FLAGS
+# - Turn on verbose makefiles so we can see and verify compile flags
+# - Set default install prefixes and library install directories
+# - Turn on shared libraries by default
 %cmake \
   CFLAGS="${CFLAGS:-%optflags}" ; export CFLAGS ; \
   CXXFLAGS="${CXXFLAGS:-%optflags}" ; export CXXFLAGS ; \
@@ -13,7 +19,10 @@
   FCFLAGS="${FCFLAGS:-%optflags%{?_fmoddir: -I%_fmoddir}}" ; export FCFLAGS ; \
   %{?__global_ldflags:LDFLAGS="${LDFLAGS:-%__global_ldflags}" ; export LDFLAGS ;} \
   %__cmake \\\
-        -DCMAKE_VERBOSE_MAKEFILE=ON \\\
+        -DCMAKE_C_FLAGS_RELEASE:STRING="-DNDEBUG" \\\
+        -DCMAKE_CXX_FLAGS_RELEASE:STRING="-DNDEBUG" \\\
+        -DCMAKE_Fortran_FLAGS_RELEASE:STRING="-DNDEBUG" \\\
+        -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \\\
         -DCMAKE_INSTALL_PREFIX:PATH=%{_prefix} \\\
         -DINCLUDE_INSTALL_DIR:PATH=%{_includedir} \\\
         -DLIB_INSTALL_DIR:PATH=%{_libdir} \\\