- --with-linux=\
- %(if [ -e /lib/modules/${kernel_version%%___*}/source ]; then \
- echo "/lib/modules/${kernel_version%%___*}/source" \
+ --with-linux="$( \
+ if [ -e "/lib/modules/${kernel_version%%___*}/source" ]; then \
+ echo "/lib/modules/${kernel_version%%___*}/source"; \