diff --git a/sea/Makefile.am b/sea/Makefile.am
index b52221e293..2e8a3b2e45 100644
--- a/sea/Makefile.am
+++ b/sea/Makefile.am
@@ -5,26 +5,29 @@ sea = boinc_$(vers).sh
 
 all: $(sea)
 
+# WARNING: WHAT FOLLOWS IS 'FRAGILE'.  DO NOT REPLACE
+# TABS WITH SPACES!
+
 $(sea): sea.tar make-sea.sh Makefile
-    ./make-sea.sh $< $@ BOINC/binstall.sh
+	./make-sea.sh $< $@ BOINC/binstall.sh
 
 sea.tar: BOINC/boinc BOINC/boincmgr BOINC/binstall.sh
-    tar cf $@ $^
+	tar cf $@ $^
 
 BOINC/boinc: ../client/boinc BOINC
-    cp $< $@
+	cp $< $@
 
 BOINC/boincmgr: ../clientgui/boincmgr BOINC
-    cp $< $@
+	cp $< $@
 
 BOINC/binstall.sh: BOINC
-    echo 'cd BOINC &&\
-    echo "cd \"`pwd`\" && ./boinc" > run_client &&\
-    chmod +x run_client &&\
-    echo now run `pwd`/run_client to run the client and `pwd`/boincmgr to run the GUI' > $@
+	echo 'cd BOINC &&\
+	echo "cd \"`pwd`\" && ./boinc" > run_client &&\
+	chmod +x run_client &&\
+	echo now run `pwd`/run_client to run the client and `pwd`/boincmgr to run the GUI' > $@
 
 BOINC:
-    mkdir -p BOINC
+	mkdir -p BOINC
 
 clean:
-    rm -rf BOINC sea.tar $(sea)
+	rm -rf BOINC sea.tar $(sea)