diff --git a/pkgs/development/libraries/science/math/lcalc/default.nix b/pkgs/development/libraries/science/math/lcalc/default.nix
index 3f0cf45062f1..b1896917658c 100644
--- a/pkgs/development/libraries/science/math/lcalc/default.nix
+++ b/pkgs/development/libraries/science/math/lcalc/default.nix
@@ -1,94 +1,38 @@
 { lib, stdenv
-, fetchurl
-, fetchpatch
+, autoreconfHook
+, gengetopt
+, pkg-config
+, fetchFromGitLab
 , pari
 }:
 
 stdenv.mkDerivation rec {
-  version = "1.23";
+  version = "2.0.5";
   pname = "lcalc";
 
-  src = fetchurl {
-    # original at http://oto.math.uwaterloo.ca/~mrubinst/L_function_public/CODE/L-${version}.tar.gz, no longer available
-    # "newer" version at google code https://code.google.com/archive/p/l-calc/source/default/source
-    url = "mirror://sageupstream/lcalc/lcalc-${version}.tar.bz2";
-    sha256 = "1c6dsdshgxhqppjxvxhp8yhpxaqvnz3d1mlh26r571gkq8z2bm43";
+  src = fetchFromGitLab {
+    owner = "sagemath";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-RxWZ7T0I9zV7jUVnL6jV/PxEoU32KY7Q1UsOL5Lonuc=";
   };
 
-  preConfigure = "cd src";
+  nativeBuildInputs = [
+    autoreconfHook
+    gengetopt
+    pkg-config
+  ];
 
   buildInputs = [
     pari
   ];
 
-  patches = [
-    # Port to newer pari
-    (fetchpatch {
-      url = "https://git.sagemath.org/sage.git/plain/build/pkgs/lcalc/patches/pari-2.7.patch?id=07d6c37d18811e2b377a9689790a7c5e24da16ba";
-      sha256 = "1x3aslldm8njjm7p9g9s9w2c91kphnci2vpkxkrcxfihw3ayss6c";
-    })
-
-    # Uncomment the definition of lcalc_to_double(const long double& x).
-    # (Necessary for GCC >= 4.6.0, cf. https://trac.sagemath.org/ticket/10892)
-    (fetchpatch {
-      url = "https://git.sagemath.org/sage.git/plain/build/pkgs/lcalc/patches/Lcommon.h.patch?id=07d6c37d18811e2b377a9689790a7c5e24da16ba";
-      sha256 = "0g4ybvsrcv48rmlh1xjnkms19jp25k58azv6ds1f2cm34hxs8fdx";
-    })
-
-    # Include also <time.h> in Lcommandline_numbertheory.h (at least required
-    # on Cygwin, cf. https://trac.sagemath.org/ticket/9845)
-    (fetchpatch {
-      url = "https://git.sagemath.org/sage.git/plain/build/pkgs/lcalc/patches/time.h.patch?id=07d6c37d18811e2b377a9689790a7c5e24da16ba";
-      sha256 = "1brf04n11kkc43ylagf8dm32j5r2g9zv51dp5wag1mpm4p04l7cl";
-    })
-
-    # Fix for gcc >4.6
-    (fetchpatch {
-      url = "https://git.sagemath.org/sage.git/plain/build/pkgs/lcalc/patches/lcalc-1.23_default_parameters_1.patch?id=07d6c37d18811e2b377a9689790a7c5e24da16ba";
-      sha256 = "0i2yvxm5fx4z0v6m4srgh8rj98kijmlvyirlxf1ky0bp2si6bpka";
-    })
-
-    # gcc 5.1
-    (fetchpatch {
-      url = "https://git.sagemath.org/sage.git/plain/build/pkgs/lcalc/patches/lcalc-1.23_default_parameters_2.patch?id=07d6c37d18811e2b377a9689790a7c5e24da16ba";
-      sha256 = "0dqwmxpm9wb53qbypsyfkgsvk2f8nf67sydphd4dkc2vw4yz6vlh";
-    })
-
-    # based on gentoos makefile patch -- fix paths, adhere to flags
-    ./makefile.patch
-
-    # (fetchpatch {
-    #   name = "default-double.patch";
-    #   url = "https://github.com/dimpase/lcalc/pull/1/commits/0500c67b6aa1f492715591669f6647c8f7a3ea59.patch";
-    #   sha256 = "0dqwmxpm9wb53qbypsyfkgsvk2f8nf67sydphd4dkc2vw4yz6vla";
-    # })
-
-    (fetchpatch {
-      name = "c++11.patch";
-      url = "https://raw.githubusercontent.com/archlinux/svntogit-community/3607b97df5a8c231191115b0cb5c62426b339e71/trunk/lcalc-c++11.patch";
-      sha256 = "1ccrl61lv2vvx8ggldq54m5d0n1iy6mym7qz0i8nj6yj0dshnpk3";
-    })
-  ] ++ lib.optional stdenv.isDarwin
-  (fetchpatch {
-    url = "https://git.sagemath.org/sage.git/plain/build/pkgs/lcalc/patches/clang.patch";
-    sha256 = "0bb7656z6cp6i4p2qj745cmq0lhh52v2akl9whi760dynfdxbl18";
-  });
-
-  postPatch = lib.optionalString stdenv.isDarwin ''
-    substituteInPlace src/Makefile --replace g++ c++
-  '';
-
-  installFlags = [
-    "DESTDIR=$(out)"
-  ];
-
-  makeFlags = [
-    "PARI_DEFINE=-DINCLUDE_PARI"
-    "PARI_PREFIX=${pari}"
+  configureFlags = [
+    "--with-pari"
   ];
 
   meta = with lib; {
-    homepage = "http://oto.math.uwaterloo.ca/~mrubinst/L_function_public/L.html";
+    homepage = "https://gitlab.com/sagemath/lcalc";
     description = "A program for calculating with L-functions";
     license = with licenses; [ gpl2 ];
     maintainers = teams.sage.members;
diff --git a/pkgs/development/libraries/science/math/lcalc/makefile.patch b/pkgs/development/libraries/science/math/lcalc/makefile.patch
deleted file mode 100644
index 5c22cf0b84e8..000000000000
--- a/pkgs/development/libraries/science/math/lcalc/makefile.patch
+++ /dev/null
@@ -1,113 +0,0 @@
-diff --git a/src/Makefile b/src/Makefile
-index 84e4e88..56ca676 100644
---- a/src/Makefile
-+++ b/src/Makefile
-@@ -58,7 +58,7 @@ ifeq ($(G5),TRUE)
-    #MACHINE_SPECIFIC_FLAGS = -mpowerpc -mpowerpc64 -m64
- endif
- 
--CCFLAGS =  -Wa,-W -O3 $(OPENMP_FLAG) -Wno-deprecated $(PREPROCESSOR_DEFINE) $(MACHINE_SPECIFIC_FLAGS) $(EXTRA)
-+CCFLAGS = $(CXXFLAGS) $(OPENMP_FLAG) $(PREPROCESSOR_DEFINE) $(MACHINE_SPECIFIC_FLAGS)
- #CCFLAGS =  -Wa,-W -O3 $(OPENMP_FLAG)  $(PREPROCESSOR_DEFINE) $(MACHINE_SPECIFIC_FLAGS) $(EXTRA)
- #CCFLAGS =  -Wa,-W -O2 -fno-exceptions -Wno-deprecated $(PREPROCESSOR_DEFINE) $(MACHINE_SPECIFIC_FLAGS) $(EXTRA)
- 
-@@ -68,12 +68,12 @@ CCFLAGS =  -Wa,-W -O3 $(OPENMP_FLAG) -Wno-deprecated $(PREPROCESSOR_DEFINE) $(MA
- 
- ifeq ($(PARI_DEFINE),-DINCLUDE_PARI)
-     #location of pari.h.
--    LOCATION_PARI_H = /usr/local/include/pari #usual location
-+    LOCATION_PARI_H = $(PARI_PREFIX)/include/pari #usual location
- 
-     #location of libpari.a or of libpari.so
-     #depending on whether static or dynamic libraries are being used.
-     #On mac os x it's the former, on linux I think usually the latter.
--    LOCATION_PARI_LIBRARY = /usr/local/lib #usual location
-+    LOCATION_PARI_LIBRARY = $(PARI_PREFIX)/lib #usual location
- else
-     #supplied as a dummy so as to avoid more ifeq's below
-     LOCATION_PARI_H = .
-@@ -89,24 +89,24 @@ INCLUDEFILES= -I../include
- 
- ifeq ($(OS_NAME),Darwin)
-     LDFLAGS2 =
--    DYN_OPTION=dynamiclib
-+    DYN_OPTION=-dynamiclib
- else
--    LDFLAGS1 = -Xlinker -export-dynamic #not sure why pari calls these when linking but on the web I found
-+    LDFLAGS1 = #not sure why pari calls these when linking but on the web I found
-     #'Libtool provides the `-export-dynamic' link flag (see section Link mode), which does this declaration.
-     #You need to use this flag if you are linking a shared library that will be dlopened'
-     #see notes below
-     #ifeq ($(PARI_DEFINE),-DINCLUDE_PARI)
--       LDFLAGS2 = $(LDFLAGS1) -Xlinker -rpath -Xlinker $(LOCATION_PARI_LIBRARY)
-+       LDFLAGS2 = $(LDFLAGS)
-     #else
-     #    LDFLAGS2 = $(LDFLAGS1)
-     #endif
--    DYN_OPTION=shared
-+    DYN_OPTION=$(LDFLAGS) -shared -Wl,-soname,libLfunction.so
- endif
- 
- ifeq ($(PARI_DEFINE),-DINCLUDE_PARI)
--    LDFLAGS = $(LDFLAGS2) -L$(LOCATION_PARI_LIBRARY) -lpari
-+    MYLDFLAGS = $(LDFLAGS2) -L$(LOCATION_PARI_LIBRARY) -lpari
- else
--    LDFLAGS = $(LDFLAGS2)
-+    MYLDFLAGS = $(LDFLAGS2)
- endif
- 
- 
-@@ -129,7 +129,8 @@ endif
- #become clear which libraries the computer can find.
- 
- 
--INSTALL_DIR= /usr/local
-+INSTALL_DIR= $(DESTDIR)
-+LIB_DIR ?=lib
- 
- #object files for the libLfunction library
- OBJ_L = Lglobals.o Lgamma.o Lriemannsiegel.o Lriemannsiegel_blfi.o Ldokchitser.o
-@@ -141,9 +142,8 @@ OBJECTS = $(OBJ3)
- 
- all:
- #	make print_vars
--	make libLfunction.so
--	make lcalc
--	make examples
-+	${MAKE} libLfunction.so
-+	${MAKE} lcalc
- #	make find_L
- #	make test
- 
-@@ -151,7 +151,7 @@ print_vars:
- 	@echo OS_NAME = $(OS_NAME)
- 
- lcalc: $(OBJECTS)
--	$(CC) $(CCFLAGS) $(INCLUDEFILES) $(OBJECTS) $(LDFLAGS) -o lcalc $(GMP_FLAGS)
-+	$(CC) $(CCFLAGS) $(INCLUDEFILES) $(OBJECTS) $(MYLDFLAGS) -o lcalc $(GMP_FLAGS)
- 
- examples:
- 	$(CC) $(CCFLAGS) $(INCLUDEFILES) example_programs/example.cc libLfunction.so -o example_programs/example $(GMP_FLAGS)
-@@ -262,15 +262,18 @@ Lcommandline.o: ../include/Lcommandline_values_zeros.h
- 
- 
- libLfunction.so: $(OBJ_L)
--	g++ -$(DYN_OPTION)  -o libLfunction.so $(OBJ_L)
-+	g++ $(DYN_OPTION) -o libLfunction.so $(OBJ_L)
- 
- clean:
- 	rm -f *.o lcalc libLfunction.so example_programs/example
- 
- install:
--	cp -f lcalc $(INSTALL_DIR)/bin/.
--	cp -f libLfunction.so $(INSTALL_DIR)/lib/.
--	cp -rf ../include $(INSTALL_DIR)/include/Lfunction
-+	install -d $(INSTALL_DIR)/bin
-+	install -d $(INSTALL_DIR)/$(LIB_DIR)
-+	install -d $(INSTALL_DIR)/include/Lfunction
-+	install lcalc $(INSTALL_DIR)/bin
-+	install libLfunction.so $(INSTALL_DIR)/$(LIB_DIR)
-+	install -m 644 -t $(INSTALL_DIR)/include/Lfunction ../include/*.h
- 
- 
- SRCS = Lcommandline.cc Lcommandline_elliptic.cc Lcommandline_globals.cc Lcommandline_misc.cc Lcommandline_numbertheory.cc Lcommandline_twist.cc Lcommandline_values_zeros.cc Lgamma.cc Lglobals.cc Lmisc.cc Lriemannsiegel.cc Lriemannsiegel_blfi.cc cmdline.c