diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b98b29..99f54c7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,8 @@ set( tidy_DAY   20 )
 
 # Allow developer to select is Dynamic or static library built
 set( LIB_TYPE STATIC )  # set default static
-option( BUILD_SHARED_LIB "Build Shared Library" OFF )
+option( BUILD_SHARED_LIB "Set ON to build Shared (DLL) Library"   OFF )
+option( BUILD_TAB2SPACE  "Set ON to build utility app, tab2space" OFF )
 
 if (CMAKE_SIZEOF_VOID_P EQUAL 8)
     message(STATUS "*** Have SIZEOF void * = 8, so 64-bit")
@@ -115,6 +116,14 @@ set_target_properties( ${name} PROPERTIES
 set_target_properties( ${name} PROPERTIES
                                VERSION   ${LIBTIDY_VERSION}
                                SOVERSION ${TIDY_MAJOR_VERSION} )
+if (BUILD_SHARED_LIB)
+set_target_properties( ${name} PROPERTIES 
+    COMPILE_FLAGS "-DBUILD_SHARED_LIB"
+    )
+set_target_properties( ${name} PROPERTIES 
+    COMPILE_FLAGS "-DBUILDING_SHARED_LIB"
+    )
+endif ()                               
 list ( APPEND add_LIBS ${name} )
 install(TARGETS ${name}
     RUNTIME DESTINATION bin
@@ -132,14 +141,21 @@ target_link_libraries( ${name} ${add_LIBS} )
 if (MSVC)
     set_target_properties( ${name} PROPERTIES DEBUG_POSTFIX d )
 endif ()
+if (BUILD_SHARED_LIB)
+set_target_properties( ${name} PROPERTIES 
+    COMPILE_FLAGS "-DBUILD_SHARED_LIB"
+    )
+endif ()                               
 install (TARGETS ${name} DESTINATION bin)
 
-set(name tab2space)
-add_executable( ${name} ${BINDIR}/tab2space.c )
-if (MSVC)
-    set_target_properties( ${name} PROPERTIES DEBUG_POSTFIX d )
+if (BUILD_TAB2SPACE)
+    set(name tab2space)
+    add_executable( ${name} ${BINDIR}/tab2space.c )
+    if (MSVC)
+        set_target_properties( ${name} PROPERTIES DEBUG_POSTFIX d )
+    endif ()
+    # no INSTALL of this 'local' tool
 endif ()
-# no INSTALL of this 'local' tool
 
 # eof
 
diff --git a/include/platform.h b/include/platform.h
index 632e458..3b60114 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -495,8 +495,14 @@ extern "C" {
 
 #if defined(_WIN32)
 
-#if (defined(_USRDLL) || defined(_WINDLL)) && !defined(TIDY_EXPORT)
+#if (defined(_USRDLL) || defined(_WINDLL)) || defined(BUILD_SHARED_LIB) && !defined(TIDY_EXPORT)
+#ifdef BUILDING_SHARED_LIB
 #define TIDY_EXPORT __declspec( dllexport ) 
+#else
+#define TIDY_EXPORT __declspec( dllimport ) 
+#endif
+#else
+#define TIDY_EXPORT extern
 #endif
 
 #ifndef TIDY_CALL
diff --git a/src/sprtf.h b/src/sprtf.h
index 23db8ae..97c9765 100644
--- a/src/sprtf.h
+++ b/src/sprtf.h
@@ -27,6 +27,8 @@
 // Debug log file output
 #ifndef _SPRTF_HXX_
 #define _SPRTF_HXX_
+#include "platform.h"
+
 #ifdef   __cplusplus
 extern "C" {
 #endif
@@ -36,32 +38,32 @@ extern "C" {
 #define MCDECL
 #endif
 
-extern int add_std_out( int val );
-extern int add_sys_time( int val );
-extern int add_sys_date( int val );
+TIDY_EXPORT int add_std_out( int val );
+TIDY_EXPORT int add_sys_time( int val );
+TIDY_EXPORT int add_sys_date( int val );
 
-extern int add_screen_out( int val );
-extern int add_list_out( int val );
-extern int add_append_log( int val );
+TIDY_EXPORT int add_screen_out( int val );
+TIDY_EXPORT int add_list_out( int val );
+TIDY_EXPORT int add_append_log( int val );
 
-extern int open_log_file( void );
-extern void close_log_file( void );
-extern void set_log_file( char * nf, int open );
-extern char * get_log_file( void );
+TIDY_EXPORT int open_log_file( void );
+TIDY_EXPORT void close_log_file( void );
+TIDY_EXPORT void set_log_file( char * nf, int open );
+TIDY_EXPORT char * get_log_file( void );
 
-extern int MCDECL sprtf( const char *pf, ... );
+TIDY_EXPORT int MCDECL sprtf( const char *pf, ... );
 #define M_MAX_SPRTF 2048
-extern int direct_out_it( char *cp );
+TIDY_EXPORT int direct_out_it( char *cp );
 
-extern char *GetNxtBuf();
+TIDY_EXPORT char *GetNxtBuf();
 
 #define EndBuf(a)   ( a + strlen(a) )
 
-extern char *get_date_stg();
-extern char *get_time_stg();
-extern char *get_date_time_stg();
+TIDY_EXPORT char *get_date_stg();
+TIDY_EXPORT char *get_time_stg();
+TIDY_EXPORT char *get_date_time_stg();
 #ifdef _MSC_VER
-extern int gettimeofday(struct timeval *tp, void *tzp);
+TIDY_EXPORT int gettimeofday(struct timeval *tp, void *tzp);
 #endif
 
 #ifndef SPRTF