build: Can't use "#" in target commands

Fixes:

    /bin/sh: syntax error: unterminated quoted string
    make: *** [../build:55: install] Error 2

1 files changed, 14 insertions, 7 deletions

diff --git a/build b/build
index 7e95002..0818545 100755
--- a/build
+++ b/build
@@ -11,13 +11,20 @@ config_enabled = \
 		for cfg in $$(printf '%s' "$${1}"); do \
 			unset IFS; \
 			[ x"$${cfg}" = x'' ] && continue; \
-			if [ x"$${cfg#!}" = x"$${cfg}" ]; then \
-				grep -q "^CONFIG_$${cfg}=y$$" <src/.config \
-					&& enabled=true; \
-			else \
-				grep -q "^CONFIG_$${cfg#!}=y$$" <src/.config \
-					&& enabled=false; \
-			fi; \
+			case "$${cfg}" in \
+				!*) \
+					cfg="$$(printf '%s' "$${cfg}" | \
+						sed 's/^!//')"; \
+					grep -q "^CONFIG_$${cfg}=y$$" \
+						<src/.config \
+						&& enabled=false; \
+					;; \
+				*) \
+					grep -q "^CONFIG_$${cfg}=y$$" \
+						<src/.config \
+						&& enabled=true; \
+					;; \
+			esac; \
 		done; \
 		unset IFS; \
 		$${enabled}; \