In auto/cc/gcc, you have:

CFLAGS="$CFLAGS -Werror"

and

CFLAGS="$CFLAGS -Wunused-variable"

so when building 1.0.2+ you receive this error:

gcc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter
-Wunused-function -Wunused-variable -Wunused-value -Werror -g -O2 -I
src/core -I src/event -I src/event/modules -I src/os/unix -I objs \
-o objs/src/event/ngx_event_openssl.o \
src/event/ngx_event_openssl.c
src/event/ngx_event_openssl.c: In function ‘ngx_ssl_get_cached_session’:
src/event/ngx_event_openssl.c:1690:31: error: variable ‘c’ set but not
used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

make[1]: *** [objs/src/event/ngx_event_openssl.o] Error 1

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