diff --git a/SConstruct b/SConstruct
index ae7b7e7..8728eff 100644
--- a/SConstruct
+++ b/SConstruct
@@ -148,32 +148,28 @@ elif platform == 'msvc6':
     for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
         env.Tool( tool )
     env['CXXFLAGS']='-GR -GX /nologo /MT'
-    env['SHARED_LIB_ENABLED'] = False
 elif platform == 'msvc70':
     env['MSVS_VERSION']='7.0'
     for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
         env.Tool( tool )
     env['CXXFLAGS']='-GR -GX /nologo /MT'
-    env['SHARED_LIB_ENABLED'] = False
 elif platform == 'msvc71':
     env['MSVS_VERSION']='7.1'
     for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
         env.Tool( tool )
     env['CXXFLAGS']='-GR -GX /nologo /MT'
-    env['SHARED_LIB_ENABLED'] = False
 elif platform == 'msvc80':
     env['MSVS_VERSION']='8.0'
     for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
         env.Tool( tool )
     env['CXXFLAGS']='-GR -EHsc /nologo /MT'
-    env['SHARED_LIB_ENABLED'] = False
 elif platform == 'mingw':
     env.Tool( 'mingw' )
     env.Append( CPPDEFINES=[ "WIN32", "NDEBUG", "_MT" ] )
-    env['SHARED_LIB_ENABLED'] = False
 elif platform.startswith('linux-gcc'):
     env.Tool( 'default' )
     env.Append( LIBS = ['pthread'], CCFLAGS = "-Wall" )
+    env['SHARED_LIB_ENABLED'] = True
 else:
     print "UNSUPPORTED PLATFORM."
     env.Exit(1)
@@ -191,7 +187,9 @@ if short_platform.startswith('msvc'):
     short_platform = short_platform[2:]
 # Notes: on Windows you need to rebuild the source for each variant
 # Build script does not support that yet so we only build static libraries.
-env['SHARED_LIB_ENABLED'] = env.get('SHARED_LIB_ENABLED', True)
+# This also fails on AIX because both dynamic and static library ends with
+# extension .a.
+env['SHARED_LIB_ENABLED'] = env.get('SHARED_LIB_ENABLED', False)
 env['LIB_PLATFORM'] = short_platform
 env['LIB_LINK_TYPE'] = 'lib'    # static
 env['LIB_CRUNTIME'] = 'mt'