diff --git a/external/external_build.cmake b/external/external_build.cmake
index ace4c8f..6a97597 100644
--- a/external/external_build.cmake
+++ b/external/external_build.cmake
@@ -52,11 +52,14 @@ SET(CONFIGURE_LDFLAGS "")
 
 if (ENABLE_SHARP)
   SET(DEP_BUILD ${BUILD_PREFIX}/sharp-prefix/src/sharp/auto)
+  IF(NOT ENABLE_OPENMP)
+    SET(SHARP_OPENMP --disable-openmp)
+  ENDIF()
   ExternalProject_Add(sharp
     URL ${CMAKE_SOURCE_DIR}/external/libsharp-6077806.tar.gz
     PREFIX ${BUILD_PREFIX}/sharp-prefix
     BUILD_IN_SOURCE 1 
-    CONFIGURE_COMMAND autoconf && ./configure "CC=${CMAKE_C_COMPILER}" "CXX=${CMAKE_CXX_COMPILER}" --prefix=${DEP_BUILD}
+    CONFIGURE_COMMAND autoconf && ./configure "CC=${CMAKE_C_COMPILER}" "CXX=${CMAKE_CXX_COMPILER}" --prefix=${DEP_BUILD} ${SHARP_OPENMP}
     BUILD_COMMAND ${CMAKE_MAKE_PROGRAM}
     INSTALL_COMMAND echo "No install"
   )