diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a868b6..c2fa8b7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,6 @@
 cmake_minimum_required(VERSION 3.24)
 project(sugar)
 
-# find_package(cppfront REQUIRED)
-
 set(CMAKE_CXX_STANDARD 20)
 enable_testing()
 
@@ -33,3 +31,6 @@ add_expect_test(id003 ./tests/003.exp)
 add_expect_test(id004 ./tests/004.exp)
 add_expect_test(id005 ./tests/005.exp)
 add_expect_test(id006 ./tests/006.exp)
+
+
+
diff --git a/src/molasses/generator_primitives_x86_64_linux.cpp b/src/molasses/generator_primitives_x86_64_linux.cpp
index 1f54e66..7a14128 100644
--- a/src/molasses/generator_primitives_x86_64_linux.cpp
+++ b/src/molasses/generator_primitives_x86_64_linux.cpp
@@ -5,7 +5,7 @@ namespace molasses {
 
 
     namespace unix_system {
-
+#ifdef linux
         struct syscall1 {
             int64_t operator()(int64_t syscall_id, int64_t p1) const {
                 int64_t ret;
@@ -71,6 +71,7 @@ namespace molasses {
                 return ret;
             }
         };
+#endif
     }
 
 
@@ -317,7 +318,9 @@ namespace molasses {
                     ) {
                         // TODO: handle errors
                     }
+#ifdef linux
                     unix_system::syscall1{}(get<int64_t>(value_0), get<int64_t>(value_1));
+#endif
                 }
             )
         );
@@ -344,7 +347,9 @@ namespace molasses {
                     ) {
                         // TODO: handle errors
                     }
+#ifdef linux
                     unix_system::syscall2{}(get<int64_t>(value_0), get<int64_t>(value_1), get<int64_t>(value_2));
+#endif
                 }
 			)
 		);
@@ -374,7 +379,9 @@ namespace molasses {
                     ) {
                         // TODO: handle errors
                     }
+#ifdef linux
                     unix_system::syscall3{}(get<int64_t>(value_0), get<int64_t>(value_1), get<int64_t>(value_2), get<int64_t>(value_3));
+#endif
                 }
 			)
 		);
@@ -407,7 +414,9 @@ namespace molasses {
                     ) {
                         // TODO: handle errors
                     }
+    #ifdef linux
                     unix_system::syscall4{}(get<int64_t>(value_0), get<int64_t>(value_1), get<int64_t>(value_2), get<int64_t>(value_3), get<int64_t>(value_4));
+    #endif
                 }
 			)
 		);
@@ -443,7 +452,9 @@ namespace molasses {
                     ) {
                         // TODO: handle errors
                     }
+        #ifdef linux
                     unix_system::syscall5{}(get<int64_t>(value_0), get<int64_t>(value_1), get<int64_t>(value_2), get<int64_t>(value_3), get<int64_t>(value_4), get<int64_t>(value_5));
+        #endif
                 }
 			)
 		);
@@ -482,6 +493,7 @@ namespace molasses {
                     ) {
                         // TODO: handle errors
                     }
+            #ifdef linux
                     unix_system::syscall6{}(
                         get<int64_t>(value_0),
                         get<int64_t>(value_1),
@@ -491,7 +503,7 @@ namespace molasses {
                         get<int64_t>(value_5),
                         get<int64_t>(value_6)
                     );
-
+            #endif
                 }
 			)
 		);
diff --git a/tests/001.exp b/tests/001.exp
index fb1c131..f996424 100644
--- a/tests/001.exp
+++ b/tests/001.exp
@@ -20,6 +20,7 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
 
 spawn -noecho $SUGAR_EXECUTABLE tests/001/exit-with-1.mol lex parse "/tmp/sugar.generated.$BUILD_NAME" generate assemble
 expect {
@@ -38,6 +39,8 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho /tmp/sugar.generated.$BUILD_NAME
 expect eof
 lassign [wait] pid spawnid os_error_flag value
diff --git a/tests/002.exp b/tests/002.exp
index 0799ba5..1837c4a 100644
--- a/tests/002.exp
+++ b/tests/002.exp
@@ -20,6 +20,7 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
 
 spawn -noecho $SUGAR_EXECUTABLE tests/002/exit-with-1.mol lex parse /tmp/sugar.generated.$BUILD_NAME generate assemble
 expect {
@@ -38,6 +39,8 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho /tmp/sugar.generated.$BUILD_NAME
 expect eof
 lassign [wait] pid spawnid os_error_flag value
diff --git a/tests/003.exp b/tests/003.exp
index bfa55ce..eb06973 100644
--- a/tests/003.exp
+++ b/tests/003.exp
@@ -25,6 +25,7 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
 
 spawn -noecho $SUGAR_EXECUTABLE tests/003/exit-with-1.mol lex tests/003/library.mol lex merge parse /tmp/sugar.generated.$BUILD_NAME generate assemble
 expect {
@@ -43,6 +44,8 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho /tmp/sugar.generated.$BUILD_NAME
 expect {
     error { abort "failed to compile" }
diff --git a/tests/005.exp b/tests/005.exp
index 37c12e5..ef0520e 100644
--- a/tests/005.exp
+++ b/tests/005.exp
@@ -20,6 +20,8 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE tests/005/exit-with-3.mol tests/005/library.mol lex-all merge-all parse
 expect {
     error { abort "failed to parse" }
@@ -32,6 +34,8 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE tests/005/exit-with-3.mol tests/005/library.mol lex-all merge-all parse
 expect {
     error { abort "failed to parse" }
@@ -44,6 +48,7 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
 
 spawn -noecho $SUGAR_EXECUTABLE tests/005/exit-with-3.mol lex tests/005/library.mol lex merge parse /tmp/sugar.generated.$BUILD_NAME generate assemble
 expect {
@@ -62,6 +67,8 @@ if {$value != 0} {
     abort "compiler crashed"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho /tmp/sugar.generated.$BUILD_NAME
 expect {
     error { abort "failed to compile" }
diff --git a/tests/006.exp b/tests/006.exp
index fd317b0..5e77865 100644
--- a/tests/006.exp
+++ b/tests/006.exp
@@ -1,7 +1,7 @@
 #!/usr/bin/expect
 
 set SUGAR_EXECUTABLE $::env(SUGAR_EXECUTABLE)
-set BUILD_NAME 005.
+set BUILD_NAME 006.
 
 proc abort {reason} {
     puts "test failed $reason"
@@ -20,6 +20,8 @@ if {$value == 0} {
     abort "compiler didn't crash"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE "fake_01.006.not_a_file" lex
 expect {
     error { abort "failed to parse" }
@@ -32,6 +34,8 @@ if {$value == 0} {
     abort "compiler didn't crash"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE "fake_01.006.not_a_file" lex-all
 expect {
     error { abort "failed to parse" }
@@ -44,6 +48,8 @@ if {$value == 0} {
     abort "compiler didn't crash"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE "tests/005/library.mol" lex merge
 expect {
     error { abort "failed to parse" }
@@ -56,6 +62,8 @@ if {$value == 0} {
     abort "compiler didn't crash"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE merge
 expect {
     error { abort "failed to parse" }
@@ -68,6 +76,8 @@ if {$value == 0} {
     abort "compiler didn't crash"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE parse
 expect {
     error { abort "failed to parse" }
@@ -109,6 +119,8 @@ if {[file exists "/tmp/006.fake_target"]} {
     file delete "/tmp/006.fake_target"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE merge-all
 expect {
     error { abort "failed to parse" }
@@ -133,6 +145,8 @@ if {$value == 0} {
     abort "compiler didn't crash"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE help
 expect {
     error { abort "failed to parse" }
@@ -145,6 +159,8 @@ if {$value != 0} {
     abort "compiler crashed displaying help"
 }
 
+# -------------------------------------------------------------------
+
 spawn -noecho $SUGAR_EXECUTABLE --help
 expect {
     error { abort "failed to parse" }