diff --git a/Makefile b/Makefile
index 3433f0e..a36a483 100755
--- a/Makefile
+++ b/Makefile
@@ -18,8 +18,8 @@ dflags = -MT $@ -MMD -MP -MF $(@:%.o=%.d)
 #  $TARGETS is provided by Makefile.cfg.
 #
 
-TARGETS := $(filter-out fxconv,$(TARGETS))
 TARGETS := $(TARGETS:fxsdk=fxsdk.sh)
+TARGETS := $(TARGETS:fxconv=fxconv-main.py)
 bin = $(TARGETS:%=bin/%)
 
 # fxconv has no sources files because it's written in Python, and fxsdk has no
@@ -30,9 +30,9 @@ obj-fxg1a := $(src-fxg1a:%=build/%.o)
 # Sed command to copy install path to fxsdk.sh. On Mac OS, BSD sed is used so
 # we need to do it a bit differently with a printf helper to insert a literal
 # newline into the command.
-sed  := '/^PREFIX=\\$$/ a \$(PREFIX)'
+sed  := -E -e '/^PREFIX=.?.?.?\\$$/ a \$(PREFIX)'
 ifeq "$(shell uname)" "Darwin"
-sed  := "$$(printf '/^PREFIX=/ a \\\n$(PREFIX)')"
+sed  := -e "$$(printf '/^PREFIX=.?.?.?/ a \\\n$(PREFIX)')"
 endif
 
 # Symbolic targets
@@ -41,11 +41,14 @@ all: $(bin)
 
 all-fxsdk: bin/fxsdk.sh
 all-fxg1a: bin/fxg1a
+all-fxconv: bin/fxconv-main.py
 
 # Explicit targets
 
 bin/fxsdk.sh: fxsdk/fxsdk.sh | bin/
-	sed -e $(sed) $< > $@
+	sed $(sed) $< > $@
+bin/fxconv-main.py: fxconv/fxconv-main.py | bin/
+	sed $(sed) $< > $@
 bin/fxg1a: $(obj-fxg1a) | bin/
 	gcc $^ -o $@ $(lflags)
 
@@ -91,11 +94,11 @@ endif
 install: $(bin)
 	install -d $(PREFIX)/bin
 	install -d $(PREFIX)/share/fxsdk
-	install $(bin:bin/fxsdk.sh=) $(m755) $(PREFIX)/bin
+	install $(filter bin/fxg1a,$(bin)) $(m755) $(PREFIX)/bin
 	install -d $(PREFIX)/share/fxsdk/assets
 	install fxsdk/assets/* $(m644) $(PREFIX)/share/fxsdk/assets
 	install bin/fxsdk.sh $(m755) $(PREFIX)/bin/fxsdk
-	install fxconv/fxconv-main.py $(m755) $(PREFIX)/bin/fxconv
+	install bin/fxconv-main.py $(m755) $(PREFIX)/bin/fxconv
 	install fxconv/fxconv.py $(m644) $(PREFIX)/bin
 
 uninstall:
diff --git a/fxconv/fxconv-main.py b/fxconv/fxconv-main.py
index db7efef..9258bd4 100755
--- a/fxconv/fxconv-main.py
+++ b/fxconv/fxconv-main.py
@@ -4,8 +4,13 @@ import getopt
 import sys
 import os
 import fxconv
+import subprocess
 
-help_string = """
+# Note: this line is edited at compile time to insert the install folder
+PREFIX="""\
+""".strip()
+
+help_string = f"""
 usage: fxconv [-s] <python script> [files...]
        fxconv  -b  <bin file> -o <object file> [parameters...]
        fxconv  -i  <png file> -o <object file> (--fx|--cg) [parameters...]
@@ -31,6 +36,8 @@ script. They accept parameters with a "category.key:value" syntax, for example:
 
 When converting images, use --fx (black-and-white calculators) or --cg (16-bit
 color calculators) to specify the target machine.
+
+Install PREFIX is set to '{PREFIX}'.
 """.strip()
 
 # Simple error-warnings system
@@ -93,10 +100,20 @@ def main():
 	if mode == "s":
 		if output is not None:
 			warn("option --output is ignored in script mode")
-		args = None if args == [] else args
 
-		err("script mode not currently implemented (TODO) x_x")
-		sys.exit(1)
+		if PREFIX == "":
+			err("unknown or invalid install path x_x")
+			sys.exit(1)
+
+		env = os.environ.copy()
+		if "PYTHONPATH" in env:
+			env["PYTHONPATH"] += f":{PREFIX}/bin"
+		else:
+			env["PYTHONPATH"] = f"{PREFIX}/bin"
+
+		p = subprocess.run([ sys.executable, input ], env=env)
+		if p.returncode != 0:
+			sys.exit(1)
 
 	# In shortcut conversion modes, read parameters from the command-line