akinmetin edited a comment on issue #1672:
URL:
https://github.com/apache/incubator-pagespeed-ngx/issues/1672#issuecomment-636364852
@Lofesa thanks it solved, but now I get this error:
```
/usr/lib/gcc/x86_64-alpine-linux-musl/9.2.0/../../../../x86_64-alpine-linux-musl/bin/ld:
opngreduc.c:(.text.opng_reduce_image+0x6bf): undefined reference to
png_set_IHDR
/usr/lib/gcc/x86_64-alpine-linux-musl/9.2.0/../../../../x86_64-alpine-linux-musl/bin/ld:
opngreduc.c:(.text.opng_reduce_image+0x8f1): undefined reference to
png_free_data
/usr/lib/gcc/x86_64-alpine-linux-musl/9.2.0/../../../../x86_64-alpine-linux-musl/bin/ld:
opngreduc.c:(.text.opng_reduce_image+0x901): undefined reference to
png_set_invalid
/usr/lib/gcc/x86_64-alpine-linux-musl/9.2.0/../../../../x86_64-alpine-linux-musl/bin/ld:
opngreduc.c:(.text.opng_reduce_image+0x921): undefined reference to
png_get_rows
collect2: error: ld returned 1 exit status
make[1]: *** [objs/Makefile:369: objs/nginx] Error 1
make: *** [Makefile:11: install] Error 2
The command '/bin/sh -c tar zxf ../nginx-${NGINX_VERSION}.tar.gz
--strip-components=1 -C . && ./configure ${NGINX_BUILD_CONFIG}
--add-module=/usr/src/ngxpagespeed
--with-ld-opt="-Wl,-z,relro,--start-group -lapr-1 -laprutil-1 -licudata -licuuc
-lpng -lturbojpeg -ljpeg" && make install -j nproc' returned a non-zero
code: 2
```
Should I modify this line too?
I tried to remove `-lpng` but still failing.
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