diff -Nuar a/nmake.opt b/nmake.opt
--- a/nmake.opt	2018-05-04 09:05:46.000000000 +0200
+++ b/nmake.opt	2018-05-11 22:58:39.387603800 +0200
@@ -124,11 +124,21 @@
 CXX_PDB_FLAGS=
 !ENDIF
 
+# Flags to choose CRT variant to link against (e.g. static: /MT, /MTd, dynamic: /MD, /MDd)
+# Ensure MRSID_CONFIG in mrsid/nmake.opt is set appropriately as well
+!IFNDEF CXX_CRT_FLAGS
+!IFNDEF DEBUG
+CXX_CRT_FLAGS=/MD
+!ELSE
+CXX_CRT_FLAGS=/MDd
+!ENDIF
+!ENDIF
+
 !IFNDEF OPTFLAGS
 !IFNDEF DEBUG
-OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP /MD /EHsc /Ox /FC /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DNDEBUG
+OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP $(CXX_CRT_FLAGS) /EHsc /Ox /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DNDEBUG
 !ELSE
-OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP /MDd /EHsc /FC /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DDEBUG
+OPTFLAGS= $(CXX_ANALYZE_FLAGS) $(CXX_PDB_FLAGS) /nologo /MP $(CXX_CRT_FLAGS) /EHsc /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE /DDEBUG
 !ENDIF
 !ENDIF  # OPTFLAGS
 
