diff --git a/cmake.opts b/cmake.opts
index 59c43ad1c232c9b0cc944f3cf1475b0e9feed079..8c5f184a1b0c7969bf624461a8e8247dd652d9ee 100644
--- a/cmake.opts
+++ b/cmake.opts
@@ -36,6 +36,7 @@ OPM_FLAGS=""
 # to build opm it might be necessary to set manually the following variables (comment the above line)
 #OPM_FLAGS="
 #-DUSE_MPI=ON
+#-DOPM_CLANG_WITH_STDC++FS=ON
 #"
 
 # set this to "ON" if you want to be able to have the headercheck target
diff --git a/cmake/modules/DumuxMacros.cmake b/cmake/modules/DumuxMacros.cmake
index 3b878c92947bf3b6c0eb36d7e93ade77acb0745a..2639ffec81719e5c97069211039d884f806be673 100644
--- a/cmake/modules/DumuxMacros.cmake
+++ b/cmake/modules/DumuxMacros.cmake
@@ -14,3 +14,7 @@ find_package(PTScotch)
 find_package(PVPython)
 find_package(Valgrind)
 find_package(Quadmath)
+# The following is required for being able to depend on OPM.
+# Remove once a better solution has been found at
+# https://github.com/OPM/opm-common/issues/1751.
+find_package(OpenMP)