diff --git a/Makefile b/Makefile
index f1bc1d4d2..98b7045af 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,7 @@ default: all
 
 # Preprocessor definitions
 DEFINES :=
+UNAME_S := $(shell uname -s)
 
 #==============================================================================#
 # Build Options                                                                #
@@ -561,10 +562,9 @@ COURSE_DATA_TARGETS := $(foreach dir,$(COURSE_DIRS),$(BUILD_DIR)/$(dir)/course_d
 #==============================================================================#
 # Source Code Generation                                                       #
 #==============================================================================#
-
 $(BUILD_DIR)/%.jp.c: %.c
 	$(call print,Encoding:,$<,$@)
-	iconv -t EUC-JP -f UTF-8 $< -o $@
+	iconv -t EUC-JP -f UTF-8 $< > $@
 
 $(BUILD_DIR)/%.o: %.c
 	$(call print,Compiling:,$<,$@)