$((fail++)) is not a required expression in POSIX, and in "dash" it
could produce an error like this:

    ./make_single_applets.sh: 61: arithmetic expression: expecting primary: 
"fail++"

Replace this with something portable: fail=$((fail+1)) would work.

Signed-off-by: Kang-Che Sung <explore...@gmail.com>
---
 make_single_applets.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/make_single_applets.sh b/make_single_applets.sh
index 8ad7a7406..329a27d32 100755
--- a/make_single_applets.sh
+++ b/make_single_applets.sh
@@ -54,18 +54,18 @@ for app; do
        fi
 
        if ! yes '' | make oldconfig >busybox_make_${app}.log 2>&1; then
-               : $((fail++))
+               fail=$((fail+1))
                echo "Config error for ${app}"
                mv .config busybox_config_${app}
        elif ! make $makeopts >>busybox_make_${app}.log 2>&1; then
-               : $((fail++))
+               fail=$((fail+1))
                grep -i -e error: -e warning: busybox_make_${app}.log
                echo "Build error for ${app}"
                mv .config busybox_config_${app}
        elif ! grep -q '^#define NUM_APPLETS 1$' include/NUM_APPLETS.h; then
                grep -i -e error: -e warning: busybox_make_${app}.log
                mv busybox busybox_${app}
-               : $((fail++))
+               fail=$((fail+1))
                echo "NUM_APPLETS != 1 for ${app}: `cat include/NUM_APPLETS.h`"
                mv .config busybox_config_${app}
        else
-- 
2.13.0

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