Expect uhal library to be installed on the system.

This simplifies an eventual containerized build of afc-epics-ioc using
epics-in-docker, allowing the μHAL build script to simply install it
directly into system directories.

We should eventually stop requiring an -I flag for cases where the
headers are installed to default system locations. This is tracked by a
uhal issue [1].

[1] lnls-dig/uhal#55

README.md

@@ -8,7 +8,7 @@ library](https://github.com/lnls-dig/uhal).
 This project uses the EPICS build system, and it depends on EPICS 7, and the
 Asyn and Autosave modules; and the μHAL library. The `configure/RELEASE.local`
 file must define the paths for `EPICS_BASE`, `ASYN`, `AUTOSAVE`, and `RETOOLS`;
-and `UHAL` and `UHAL_LIBS`.
+and the μHAL library is expected to be installed to `/usr/local`.
 
 ## Licensing
 

utcaApp/src/Makefile

@@ -34,11 +34,9 @@ utca_DBD += aSubRoutines.dbd
 
 utca_DBD += menuScan.dbd
 
-utca_LIBS += uhal-modules uhal-utilities
-uhal-utilities_DIR = $(UHAL_LIBS)
-uhal-modules_DIR = $(UHAL_LIBS)
+utca_SYS_LIBS += uhal-modules uhal-utilities
 
-OP_SYS_INCLUDES += -I$(UHAL)/include/uhal
+OP_SYS_INCLUDES += -I/usr/local/include/uhal
 USR_CXXFLAGS += -std=c++20 -Wall -Wextra
 
 # Build the IOC application