Error linking SSL and crypto libraries installed in custom location - makefile

Question

I am trying to create a shared library that is to be linked against OpenSSL-1.0.2p which depends on libssl1.0. The installed version of OpenSSL on my ubuntu bionic machine is however OpenSSL-1.1.1 which internally uses libssl1.1.
Since I do not wish to install OpenSSL-1.0 system-wide, I downloaded and compiled it separately installing it into a folder inside my home directory.
I wish to use this location against which I would want my shared library to link. Here is the Makefile for the shared library that I am trying to create:
APPBASE=/home/AB/Documents/APP/APP_2.17.0
OPENSSL1.0.2p_INSTALL_LOC=/home/AB/Documents/APP/OpenSSL-1.0.2p-installation
CC=gcc
#CFLAGS= -Wall -g -O -fPIC
CFLAGS= -Wall -g -O -static
RM= rm -f
.PHONY: all clean
src=$(wildcard *Generic/*.c *Linux/*.c)
$(info source=$(src))
#we use the custom compiled openssl version
#and NOT the one available on the system
#INC=-I/usr/include/openssl
INC+=-I$(OPENSSL1.0.2p_INSTALL_LOC)/include/openssl
INC+=$(foreach d,$(incdir),-I$d)
$(info includes=$(INC))
LIB=-L$(OPENSSL1.0.2p_INSTALL_LOC)/lib
LIB+=-l:libssl.a -l:libcrypto.a
# looks like we need this for proper static linking of libc
LIB+= -static-libgcc
$(info links=$(LIB))
obj=$(src:.c=.o)
#all: libAPP.so
all: libAPP.a
clean:
$(RM) *.o *.so
$(shell find $(APPBASE) -type f -iname "*.o" -exec rm -rf {} \;)
.c.o:
${CC} ${CFLAGS} $(INC) -c $< -o $#
#${CC} ${CFLAGS} $(INC) -c $< -o $#
libAPP.a: $(obj)
#ar rcs $# $^
#$(LINK.c) -shared $^ -o $#
However, make reports that the header files being included are from the system's openssl installation and hence the compile is failing (since it is expecting OpenSSL-1.0.2p). Here's a sample:
In file included from /usr/include/openssl/e_os2.h:13:0,
from /usr/include/openssl/bio.h:13,
from /usr/include/openssl/x509v3.h:13,
.... (source file 1)
gcc -static -Wall -g -O -fPIC -I/home/AB/Documents/APP/OpenSSL-1.0.2p-installation/include/openssl -I*/path/to/app/include1* -I*/path/to/app/include2* -c */path/to/src1* -L/home/AB/Documents/APP/OpenSSL-1.0.2p-installation/lib -lssl -lcrypto
sr1.c: In function ‘Get_CACertificates’: warning: implicit declaration of function ‘CRYPTO_w_lock’; did you mean ‘CRYPTO_zalloc’? [-Wimplicit-function-declaration]
CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
^~~~~~~~~~~~~
CRYPTO_zalloc
CRYPTO_w_lock is a macro which is no longer present in the latest version of crypto.h (OpenSSL-1.1) which makes it clear that my application is still looking at the system version of OpenSSL.
Within my source files, I am including the SSL header files like so:
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
Although angular braces are supposed to tell the compiler to look into the system's header files, doesn't the -L on the command line as well as the -I flags force it to look for them in the said directories before looking at the system files?
I do have a crypto.h file in the custom install location for OpenSSL but the compiler seems to be ignore it for some reason
ab#ab1-pc:/home/AB/Documents/APP/OpenSSL-1.0.2p-installation$ find . -iname "crypto.h"
./include/openssl/crypto.h
What am I missing here?
UPDATE 1: As suggested by Darren, removed the trailing openssl so now my include path is
INC+=-I$(OPENSSL1.0.2p_INSTALL_LOC)/include and voila I can see the shared library getting created. However when I try to find references to ssl within this newly minted shared library, I see that I have 87 entries (which includes ALL symbols having ssl as part of their name)
ab#ab1-pc:~/Documents/AB/APP_2.17.0$ nm libAPP.so | grep -i "ssl" | wc -l
87
whereas listing only the global symbols from libssl.a tells me it has 1113 globally defined symbols.
ab#ab1-pc:~/Documents/AB/APP_2.17.0$ nm -g ../OpenSSL-1.0.2p-installation/lib/libssl.a | grep -i "ssl" | wc -l
1113
Shouldn't the former count be MORE than the latter?? Has it got something to do with the fact that my 'app' is a shared library? Even then shouldn't it pull in ALL the symbols (at least the global ones) from any static libraries it links against??
UPDATE 2: Now apparently since I was facing issues with SSL symbols, I switched to creating a static library so made changes to the makefile accordingly.

Answer 1

In this line:
INC+=-I$(OPENSSL1.0.2p_INSTALL_LOC)/include/openssl
... try changing it to:
INC+=-I$(OPENSSL1.0.2p_INSTALL_LOC)/include
... i.e., without the 'openssl' part.
Your includes, e.g.,
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
... expect directory search paths to terminate on the 'include/', not on the 'openssl'.