Trying to build from the official php:7.1-fpm-alpine image, using the following excerpt in my Dockerfile:
FROM php:7.1-fpm-alpine
RUN set -ex \
apk add --no-cache --virtual .build-deps \
freetype-dev \
libjpeg-turbo-dev \
libpng-dev \
\
&& docker-php-ext-configure gd \
--with-freetype-dir=/usr \
--with-png-dir=/usr \
--with-jpeg-dir=/usr \
&& docker-php-ext-install gd \
&& apk del .build-deps
When attempting to build this with docker build, GD fails during ./configure with the following error:
configure: error: jpeglib.h not found
I can confirm that jpeglib.h exists and is exactly where I think it should be (indeed, exactly where it is in Debian variants):
$ docker run -it --rm php:7.1-fpm-alpine /bin/sh
>$ apk add --no-cache libjpeg-turbo-dev \
&& find /usr -type f -name 'jpeglib.h'
...
/usr/include/jpeglib.h
But if I take exactly the same command used in the dockerfile and run it interactively inside the container, it builds flawlessly. No errors.
Is this a bug, or am I missing something?
The problem was a blindingly simple syntax error; the apk call following the set command needs to be preceded by &&, otherwise the interpreter is treating the entire apk call as a set of arguments to set. In that case, the packages aren't added, therefore jpeglib.h didn't exist.
When I typed the command into the shell, I used the correct syntax, so it passed without error.
yes, you should write like this
RUN set -ex \
&& apk add --no-cache --virtual .build-deps \