QT += quick

CONFIG += c++11

#qxorm ok init
include(../QxOrm/QxOrm.pri)
TEMPLATE = app
DEFINES += _BUILDING_QX_BLOG
INCLUDEPATH += ../QxOrm/include/
DESTDIR = $$PWD/_bin/
LIBS += -L"$$PWD/libQxormx32"

CONFIG(debug, debug|release) {
TARGET = TecnoUnlockerDb
LIBS += -l"QxOrmd"
} else {
TARGET = TecnoUnlockerDb
LIBS += -l"QxOrm"
} # CONFIG(debug, debug|release)

!contains(DEFINES, _QX_NO_PRECOMPILED_HEADER) {
PRECOMPILED_HEADER = ./include/precompiled.h
} # !contains(DEFINES, _QX_NO_PRECOMPILED_HEADER)
#qxorm ok end

DEFINES += QT_DEPRECATED_WARNINGS

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES +=
classproyects/conectmongodb.cpp
main.cpp
mi_c_file.c

RESOURCES += qml.qrc

Additional import path used to resolve QML modules in Qt Creator's code model

QML_IMPORT_PATH =

Additional import path used to resolve QML modules just for Qt Quick Designer

QML_DESIGNER_IMPORT_PATH =

Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

HEADERS +=
classproyects/conectmongodb.h
include/author.h
include/export.h

That said, there's no mention of any .c file in what you posted.

QT += quick

CONFIG += c++11

#qxorm ok init
include(../QxOrm/QxOrm.pri)
TEMPLATE = app
DEFINES += _BUILDING_QX_BLOG
INCLUDEPATH += ../QxOrm/include/
DESTDIR = $$PWD/_bin/
LIBS += -L"$$PWD/libQxormx32"

CONFIG(debug, debug|release) {
TARGET = TecnoUnlockerDb
LIBS += -l"QxOrmd"
} else {
TARGET = TecnoUnlockerDb
LIBS += -l"QxOrm"
} # CONFIG(debug, debug|release)

!contains(DEFINES, _QX_NO_PRECOMPILED_HEADER) {
PRECOMPILED_HEADER = ./include/precompiled.h
} # !contains(DEFINES, _QX_NO_PRECOMPILED_HEADER)
#qxorm ok end

DEFINES += QT_DEPRECATED_WARNINGS

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES +=
classproyects/conectmongodb.cpp
main.cpp

RESOURCES += qml.qrc

Additional import path used to resolve QML modules in Qt Creator's code model

QML_IMPORT_PATH =

Additional import path used to resolve QML modules just for Qt Quick Designer

QML_DESIGNER_IMPORT_PATH =

Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

HEADERS +=
classproyects/conectmongodb.h
include/author.h
include/export.h

the project works correctly, say that this is a simple implementation to show the error.

In this last photo you can see qxorm working correctly qml ok the static project with its dependencies all ok. I mean, just adding a .c file damages the app and stops recognizing the libraries that worked before

I have to integrate another project that is practically developed in c and I can't redeploy the project. I've already wasted a lot of time with qxorm for this reason. I must assume that it's incompatible with c or is it something I have to do with qt

As @jsulm already requested, how are you adding that file ?
What exact error are you getting ?