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/etc/R/Makeconf is in r-base-core 3.4.4-1ubuntu1.

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The actual contents of the file can be viewed below.

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# etc/Makeconf.  Generated from Makeconf.in by configure.
#
# ${R_HOME}/etc/Makeconf
#
# R was configured using the following call
# (not including env. vars and site configuration)
# configure  '--prefix=/usr' '--with-cairo' '--with-jpeglib' '--with-readline' '--with-tcltk' '--with-system-bzlib' '--with-system-pcre' '--with-system-zlib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share/R/share' '--includedir=/usr/share/R/include' '--with-blas' '--with-lapack' '--enable-R-profiling' '--enable-R-shlib' '--enable-memory-profiling' '--without-recommended-packages' '--build' 'x86_64-linux-gnu' 'build_alias=x86_64-linux-gnu' 'R_PRINTCMD=/usr/bin/lpr' 'R_PAPERSIZE=letter' 'R_BROWSER=xdg-open' 'LIBnn=lib' 'JAVA_HOME=/usr/lib/jvm/default-java' 'CC=gcc -std=gnu99' 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=' 'F77=gfortran' 'FFLAGS=-g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong' 'CXX=g++' 'CXXFLAGS=-g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g' 'FC=gfortran' 'FCFLAGS=-g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong'

## This fails if it contains spaces, or if it is quoted
include $(R_SHARE_DIR)/make/vars.mk

AR = ar
BLAS_LIBS = -lblas
C_VISIBILITY = -fvisibility=hidden
CC = gcc -std=gnu99
CFLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g $(LTO)
CPICFLAGS = -fpic
CPPFLAGS = 
CXX = g++ 
CXXCPP = $(CXX) -E
CXXFLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g $(LTO)
CXXPICFLAGS = -fpic
CXX98 = g++
CXX98FLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g
CXX98PICFLAGS = -fpic
CXX98STD = -std=gnu++98
CXX11 = g++
CXX11FLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g
CXX11PICFLAGS = -fpic
CXX11STD = -std=gnu++11
CXX14 = g++
CXX14FLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g
CXX14PICFLAGS = -fpic
CXX14STD = 
CXX17 = g++
CXX17FLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g
CXX17PICFLAGS = -fpic
CXX17STD = -std=gnu++17
DYLIB_EXT = .so
DYLIB_LD = $(CC)
DYLIB_LDFLAGS = -shared -fopenmp# $(CFLAGS) $(CPICFLAGS)
DYLIB_LINK = $(DYLIB_LD) $(DYLIB_LDFLAGS) $(LDFLAGS)
ECHO = echo
ECHO_C = 
ECHO_N = -n
ECHO_T = 
## NB, set FC before F77 as on Solaris make, setting FC sets F77
FC = gfortran
FCFLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong $(LTO)
## additional libs needed when linking with $(FC), e.g. on some Oracle compilers
FCLIBS = 
F77 = gfortran
F77_VISIBILITY = -fvisibility=hidden
FFLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong $(LTO)
FLIBS =  -lgfortran -lm -lquadmath
FCPICFLAGS = -fpic
FPICFLAGS = -fpic
FOUNDATION_CPPFLAGS = 
FOUNDATION_LIBS = 
JAR = /usr/lib/jvm/default-java/bin/jar
JAVA = /usr/lib/jvm/default-java/bin/java
JAVAC = /usr/lib/jvm/default-java/bin/javac
JAVAH = 
## JAVA_HOME might be used in the next three.  
## They are for packages 'JavaGD' and 'rJava'
JAVA_HOME = /usr/lib/jvm/default-java
JAVA_CPPFLAGS = -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux
JAVA_LIBS = -L$(JAVA_HOME)/lib/server -ljvm
JAVA_LD_LIBRARY_PATH = $(JAVA_HOME)/lib/server
LAPACK_LIBS = -llapack
## we only need this is if it is external, as otherwise link to R
LIBINTL= 
LIBM = -lm
LIBR0 = -L$(R_HOME)/lib$(R_ARCH)
LIBR1 = -lR
LIBR = -L$(R_HOME)/lib$(R_ARCH) -lR
LIBS =  -lpcre -llzma -lbz2 -lz -lrt -ldl -lm -licuuc -licui18n
## needed by R CMD config
LIBnn = lib
LIBTOOL = $(SHELL) "$(R_HOME)/bin/libtool"
LDFLAGS = -Wl,-Bsymbolic-functions -Wl,-z,relro
LTO = 
## needed to build applications linking to static libR
MAIN_LD = $(CC)
MAIN_LDFLAGS = -Wl,--export-dynamic -fopenmp
MAIN_LINK = $(MAIN_LD) $(MAIN_LDFLAGS) $(LDFLAGS)
MKINSTALLDIRS = $(R_HOME)/bin/mkinstalldirs
OBJC = 
OBJCFLAGS =  $(LTO)
OBJC_LIBS = 
OBJCXX = 
R_ARCH = 
RANLIB = ranlib
SAFE_FFLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -ffloat-store
SED = /bin/sed
SHELL = /bin/bash
SHLIB_CFLAGS = 
SHLIB_CXXFLAGS = 
SHLIB_CXXLD = $(CXX)
SHLIB_CXXLDFLAGS = -shared
SHLIB_CXX98LD = $(CXX98) $(CXX98STD)
SHLIB_CXX98LDFLAGS = -shared
SHLIB_CXX11LD = $(CXX11) $(CXX11STD)
SHLIB_CXX11LDFLAGS = -shared
SHLIB_CXX14LD = $(CXX14) $(CXX14STD)
SHLIB_CXX14LDFLAGS = -shared
SHLIB_CXX17LD = $(CXX17) $(CXX17STD)
SHLIB_CXX17LDFLAGS = -shared
SHLIB_EXT = .so
SHLIB_FCLD = $(FC)
SHLIB_FCLDFLAGS = -shared
SHLIB_FFLAGS = 
SHLIB_LD = $(CC)
SHLIB_LDFLAGS = -shared# $(CFLAGS) $(CPICFLAGS)
SHLIB_LIBADD = 
## We want to ensure libR is picked up from $(R_HOME)/lib
## before e.g. /usr/local/lib if a version is already installed.
SHLIB_LINK = $(SHLIB_LD) $(SHLIB_LDFLAGS) $(LIBR0) $(LDFLAGS)
SHLIB_OPENMP_CFLAGS = -fopenmp
SHLIB_OPENMP_CXXFLAGS = -fopenmp
SHLIB_OPENMP_FCFLAGS = -fopenmp
SHLIB_OPENMP_FFLAGS = -fopenmp
STRIP_LIBS = strip --strip-unneeded
STRIP_STATIC_LIBS = strip --strip-debug
TCLTK_CPPFLAGS = -I/usr/include/tcl8.6 -I/usr/include/tcl8.6 
TCLTK_LIBS = -L/usr/lib/x86_64-linux-gnu -ltcl8.6 -L/usr/lib/x86_64-linux-gnu -ltk8.6 -lX11 -lXss -lXext
YACC = bison -y

## legacy
CXX1X = g++
CXX1XFLAGS = -g -O2 -fdebug-prefix-map=/build/r-base-AitvI6/r-base-3.4.4=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g
CXX1XPICFLAGS = -fpic
CXX1XSTD = -std=gnu++11
SHLIB_CXX1XLD = $(CXX11) $(CXX11STD)
SHLIB_CXX1XLDFLAGS = -shared


## for linking to libR.a
STATIC_LIBR = # -Wl,--whole-archive "$(R_HOME)/lib$(R_ARCH)/libR.a" -Wl,--no-whole-archive $(BLAS_LIBS) $(FLIBS)  $(LIBINTL) -lreadline  $(LIBS)

R_XTRA_CFLAGS = 
R_XTRA_CPPFLAGS =  -I$(R_INCLUDE_DIR) -DNDEBUG
R_XTRA_CXXFLAGS = 
R_XTRA_FFLAGS = 

ALL_CFLAGS = $(R_XTRA_CFLAGS) $(PKG_CFLAGS) $(CPICFLAGS) $(SHLIB_CFLAGS) $(CFLAGS)
ALL_CPPFLAGS = $(R_XTRA_CPPFLAGS) $(PKG_CPPFLAGS) $(CLINK_CPPFLAGS) $(CPPFLAGS)
ALL_CXXFLAGS = $(R_XTRA_CXXFLAGS) $(PKG_CXXFLAGS) $(CXXPICFLAGS) $(SHLIB_CXXFLAGS) $(CXXFLAGS)
ALL_OBJCFLAGS = $(PKG_OBJCFLAGS) $(CPICFLAGS) $(SHLIB_CFLAGS) $(OBJCFLAGS)
ALL_OBJCXXFLAGS = $(PKG_OBJCXXFLAGS) $(CXXPICFLAGS) $(SHLIB_CXXFLAGS) $(OBJCXXFLAGS)
ALL_FFLAGS = $(R_XTRA_FFLAGS) $(PKG_FFLAGS) $(FPICFLAGS) $(SHLIB_FFLAGS) $(FFLAGS)
## LIBR here as a couple of packages use this without SHLIB_LINK
ALL_LIBS = $(PKG_LIBS) $(SHLIB_LIBADD) $(LIBR)# $(LIBINTL)

.SUFFIXES:
.SUFFIXES: .c .cc .cpp .d .f .f90 .f95 .m .mm .M .o

.c.o:
	$(CC) $(ALL_CPPFLAGS) $(ALL_CFLAGS) -c $< -o $@
.c.d:
	@echo "making $@ from $<"
	@$(CC) -MM $(ALL_CPPFLAGS) $< > $@
.m.d:
	@echo > $@
.cc.o:
	$(CXX) $(ALL_CPPFLAGS) $(ALL_CXXFLAGS) -c $< -o $@
.cpp.o:
	$(CXX) $(ALL_CPPFLAGS) $(ALL_CXXFLAGS) -c $< -o $@
.cc.d:
	@echo "making $@ from $<"
	@$(CXX) -M $(ALL_CPPFLAGS) $< > $@
.cpp.d:
	@echo "making $@ from $<"
	@$(CXX) -M $(ALL_CPPFLAGS) $< > $@
.m.o:
	$(OBJC) $(ALL_CPPFLAGS) $(ALL_OBJCFLAGS) -c $< -o $@
.mm.o:
	$(OBJCXX) $(ALL_CPPFLAGS) $(ALL_OBJCXXFLAGS) -c $< -o $@
.M.o:
	$(OBJCXX) $(ALL_CPPFLAGS) $(ALL_OBJCXXFLAGS) -c $< -o $@
.f.o:
	$(F77) $(ALL_FFLAGS) -c $< -o $@
.f95.o:
	$(FC) $(PKG_FCFLAGS) $(FCPICFLAGS) $(FCFLAGS) -c  $< -o $@
.f90.o:
	$(FC) $(PKG_FCFLAGS) $(FCPICFLAGS) $(FCFLAGS) -c  $< -o $@