Proper way to make a cmake project (pri) dependent on another cmake project (pri)

[fcarney]

I have 2 cmake projects that provide me with .a libs and headers when compiled. However, one is dependent on the other. I am struggling to make one see everything from the other. Here is what I have so far:
open62541.pri:

OPEN62541_SRC = $$PWD/open62541
OPEN62541_BUILD = $$OBJECTS_DIR/open62541
OPEN62541_OPTS = -DUA_ENABLE_ENCRYPTION=ON -DUA_ENABLE_HISTORIZING=ON
OPEN62541_LIBS = $$PWD/$$OBJECTS_DIR/mbedtls/lib
OPEN62541_INCLUDES = $$PWD/$$OBJECTS_DIR/mbedtls/include
OPEN62541_MBEDTLS = $$PWD/$$OBJECTS_DIR/mbedtls
MBETLS_PATHS = -DMBEDTLS_INCLUDE_DIRS=$$OPEN62541_INCLUDES -DMBEDCRYPTO_LIBRARY=$$OPEN62541_LIBS -DMBEDTLS_LIBRARY=$$OPEN62541_LIBS -DMBEDX509_LIBRARY=$$OPEN62541_LIBS
open62541.target = $$OPEN62541_BUILD/lib/libopen62541.a
open62541.commands  = mkdir -p $$OPEN62541_BUILD
open62541.commands += && cd $$OPEN62541_BUILD
#open62541.depends += mbedtls
#contains(QMAKE_HOST.arch, arm.*):{
message(QMAKESPEC $$QMAKESPEC)
contains(QMAKESPEC, .*linux-arm.*) {
    message("arm gcc chosen")
    open62541.commands += && cmake -DCMAKE_PREFIX_PATH=$$[QT_INSTALL_LIBS]/cmake -DCMAKE_INSTALL_PREFIX=\$\$(pwd) -DCMAKE_INSTALL_LIBDIR=lib $$MBETLS_PATHS -DCMAKE_INCLUDE_PATH=$$OPEN62541_INCLUDES -DCMAKE_CXX_COMPILER=arm-linux-gnueabihf-g++ -DCMAKE_C_COMPILER=arm-linux-gnueabihf-gcc $$OPEN62541_OPTS $$OPEN62541_SRC
}else{
    message("x86 gcc chosen")
    open62541.commands += && cmake -DCMAKE_PREFIX_PATH=$$[QT_INSTALL_LIBS]/cmake -DCMAKE_INSTALL_PREFIX=\$\$(pwd) -DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_LIBRARY_PATH=$$OPEN62541_LIBS -DCMAKE_INCLUDE_PATH=$$OPEN62541_INCLUDES -DQT_QMAKE_EXECUTABLE=\$(QMAKE) $$OPEN62541_OPTS $$OPEN62541_SRC
}
open62541.commands += && make install
QMAKE_EXTRA_TARGETS += open62541

PRE_TARGETDEPS += $$open62541.target
INCLUDEPATH += $$OPEN62541_BUILD/include
LIBS += -L$$OPEN62541_BUILD/lib -lopen62541

QMAKE_DISTCLEAN += "$$OBJECTS_DIR/open62541" -r

mbedtls.pri:

MBEDTLS_SRC = $$PWD/mbedtls
MBEDTLS_BUILD = $$OBJECTS_DIR/mbedtls
mbedtls.target = $$MBEDTLS_BUILD/lib/libmbedtls.a
mbedtls.commands  = mkdir -p $$MBEDTLS_BUILD
mbedtls.commands += && cd $$MBEDTLS_BUILD
contains(QMAKESPEC, .*linux-arm.*) {
    mbedtls.commands += && cmake -DCMAKE_PREFIX_PATH=$$[QT_INSTALL_LIBS]/cmake -DCMAKE_INSTALL_PREFIX=\$\$(pwd)  -DCMAKE_CXX_COMPILER=arm-linux-gnueabihf-g++ -DCMAKE_C_COMPILER=arm-linux-gnueabihf-gcc $$MBEDTLS_OPTS $$MBEDTLS_SRC
}else{
    mbedtls.commands += && cmake -DCMAKE_PREFIX_PATH=$$[QT_INSTALL_LIBS]/cmake -DCMAKE_INSTALL_PREFIX=\$\$(pwd) -DCMAKE_INSTALL_LIBDIR=lib -DQT_QMAKE_EXECUTABLE=\$(QMAKE) $$MBEDTLS_OPTS $$MBEDTLS_SRC
}
mbedtls.commands += && make install
#mbedtls.commands += && make mbedtls
QMAKE_EXTRA_TARGETS += mbedtls

PRE_TARGETDEPS += $$mbedtls.target
INCLUDEPATH += $$MBEDTLS_BUILD/include
LIBS += -L$$MBEDTLS_BUILD/lib -lmbedcrypto -lmbedx509 -lmbedtls

QMAKE_DISTCLEAN += "$$OBJECTS_DIR/mbedtls" -r

I need to be able to compile these in a build directory. Which they do fine. The issue is open62541 is dependent upon mbedtls.pri.

Edit:
Ah crap. I think I may have just figured out how to do this! Use the proper sub project crap I used to include these in the main project... Nevermind on this statement. I have no clue what I am doing.

[fcarney]

My paths were relative to a cd. This messed things up.